Just install SP2.

SP2 rarely gives problems, the main thing to watch-out for is to scan the
computer for Trojans or malware first, as sometimes their presence can cause
the install to go badly wrong.  

-------------------------------
2000/XP/Vista Netwok Logon Applet:
http://mylogon.net
Say No to Preinstalled Junk:
http://genuinewindows.co.uk

Burn the sp2 to cd, unless the PC is behind a nat router, otherwise it will
almost certainly be compromised before the update is downloaded

You do not have to install SP1 and then SP2...  As the web page for SP2
states - it is cumulative.

Download and install from the list below (download now, burn to CD/DVD,
install on the machine before even connecting to the Internet..) and you
won't have too much downloading to do when things are over.  Note that you
may want to think twice about installing Internet Explorer 7 and Media
Player 11 on such a machine.  IE7 can be a 'bit much' for older machines and
Media Player 11 has the same issue.  Not to mention both may conflict in
strange ways with programs you may have on said machine from the base
install.

Direct Download of Service Pack 2 (SP2) for Windows XP
http://snipurl.com/8bqy

Critical Updates
----------------------
Released: -- [ Web Page Address ] -- Description:
9/14/2004 -- [ http://support.microsoft.com/kb/885626 ]
 -- Critical Update for Windows XP
11/22/2004 -- [ http://support.microsoft.com/kb/887742 ]
 -- Update for Windows XP
12/13/2004 -- [ http://support.microsoft.com/kb/885835 ]
 -- Security Update for Windows XP
12/13/2004 -- [ http://support.microsoft.com/kb/885836 ]
 -- Security Update for Windows XP
12/13/2004 -- [ http://support.microsoft.com/kb/886185 ]
 -- Critical Update for Windows XP
12/13/2004 -- [ http://support.microsoft.com/kb/873339 ]
 -- Security Update for Windows XP
2/7/2005 -- [ http://support.microsoft.com/kb/891781 ]
 -- Security Update for Windows XP
2/7/2005 -- [ http://support.microsoft.com/kb/888302 ]
-- Security Update for Windows XP
2/7/2005 -- [ http://support.microsoft.com/kb/887472 ]
 -- Security Update for Windows Messenger
4/11/2005 -- [ http://support.microsoft.com/kb/890859 ]
 -- Security Update for Windows XP
5/18/2005 -- [ http://support.microsoft.com/kb/894391 ]
 -- Update for Windows XP
5/24/2005 -- [ http://support.microsoft.com/kb/896344 ]
 -- Update for Windows XP
6/13/2005 -- [ http://support.microsoft.com/kb/896358 ]
 -- Security Update for Microsoft Windows XP
6/13/2005 -- [ http://support.microsoft.com/kb/896428 ]
 -- Security Update for Windows XP
6/24/2005 -- [ http://support.microsoft.com/kb/900930 ]
 -- Update for Windows XP
6/27/2005 -- [ http://support.microsoft.com/kb/898461 ]
 -- Update for Windows XP
7/11/2005 -- [ http://support.microsoft.com/kb/901214 ]
 -- Security Update for Windows XP
8/8/2005 -- [ http://support.microsoft.com/kb/896423 ]
 -- Security Update for Windows XP
8/8/2005 -- [ http://support.microsoft.com/kb/899587 ]
 -- Security Update for Windows XP
8/8/2005 -- [ http://support.microsoft.com/kb/899591 ]
 -- Security Update for Windows XP
8/8/2005 -- [ http://support.microsoft.com/kb/893756 ]
 -- Security Update for Windows XP
10/10/2005 -- [ http://support.microsoft.com/kb/901017 ]
 -- Security Update for Windows XP
10/10/2005 -- [ http://support.microsoft.com/kb/902400 ]
 -- Security Update for Windows XP
10/10/2005 -- [ http://support.microsoft.com/kb/905749 ]
-- Security Update for Windows XP
10/10/2005 -- [ http://support.microsoft.com/kb/905414 ]
 -- Security Update for Windows XP
10/10/2005 -- [ http://support.microsoft.com/kb/900725 ]
 -- Security Update for Windows XP
11/7/2005 -- [ http://support.microsoft.com/kb/896424 ]
 -- Security Update for Windows XP
12/12/2005 -- [ http://support.microsoft.com/kb/910437 ]
 -- Update for Windows XP
12/13/2005 -- [ http://support.microsoft.com/kb/904706 ]
 -- Security Update for Windows XP
1/5/2006 -- [ http://support.microsoft.com/kb/912919 ]
 -- Security Update for Windows XP
1/9/2006 -- [ http://support.microsoft.com/kb/908519 ]
-- Security Update for Windows XP
2/13/2006 -- [ http://support.microsoft.com/kb/911927 ]
 -- Security Update for Windows XP
4/10/2006 -- [ http://support.microsoft.com/kb/911562 ]
 -- Security Update for Windows XP
4/18/2006 -- [ http://support.microsoft.com/kb/904942 ]
-- Update for Windows XP
4/25/2006 -- [ http://support.microsoft.com/kb/900485 ]
 -- Update for Windows XP
4/25/2006 -- [ http://support.microsoft.com/kb/908531 ]
 -- Security Update for Windows XP
5/9/2006 -- [ http://support.microsoft.com/kb/913580 ]
 -- Security Update for Windows XP
6/6/2006 -- [ http://support.microsoft.com/kb/916595 ]
 -- Update for Windows XP
6/8/2006 -- [ http://support.microsoft.com/kb/918439 ]
 -- Vulnerability in ART Image Rendering Could Allow Remote Code
     Execution in Internet Explorer for Windows XP SP2
6/12/2006 -- [ http://support.microsoft.com/kb/914389 ]
 -- Security Update for Windows XP
6/12/2006 -- [ http://support.microsoft.com/kb/917953 ]
 -- Security Update for Windows XP
6/13/2006 -- [ http://support.microsoft.com/kb/917344 ]
 -- JScript 5.6 Security Update for Windows XP SP1 and SP2
6/27/2006 -- [ http://support.microsoft.com/kb/911280 ]
 -- Security Update for Windows XP
7/10/2006 -- [ http://support.microsoft.com/kb/917159 ]
 -- Security Update for Windows XP
7/10/2006 -- [ http://support.microsoft.com/kb/914388 ]
 -- Security Update for Windows XP
8/7/2006 -- [ http://support.microsoft.com/kb/917422 ]
 -- Security Update for Windows XP
8/7/2006 -- [ http://support.microsoft.com/kb/920670 ]
 -- Security Update for Windows XP
8/7/2006 -- [ http://support.microsoft.com/kb/922616 ]
 -- Security Update for Windows XP
8/7/2006 -- [ http://support.microsoft.com/kb/920683 ]
 -- Security Update for Windows XP
8/7/2006 -- [ http://support.microsoft.com/kb/921398 ]
 -- Security Update for Windows XP
8/17/2006 -- [ http://support.microsoft.com/kb/920872 ]
 -- Update for Windows XP
9/11/2006 -- [ http://support.microsoft.com/kb/920685 ]
 -- Security Update for Windows XP
9/11/2006 -- [ http://support.microsoft.com/kb/922582 ]
 -- Update for Windows XP
9/11/2006 -- [ http://support.microsoft.com/kb/919007 ]
 -- Security Update for Windows XP
9/26/2006 -- [ http://support.microsoft.com/kb/925486 ]
 -- Security Update for Windows XP SP2
10/9/2006 -- [ http://support.microsoft.com/kb/922819 ]
 -- Security Update for Windows XP
10/9/2006 -- [ http://support.microsoft.com/kb/924496 ]
 -- Security Update for Windows XP
10/9/2006 -- [ http://support.microsoft.com/kb/923414 ]
 -- Security Update for Windows XP
10/9/2006 -- [ http://support.microsoft.com/kb/923191 ]
 -- Security Update for Windows XP
11/14/2006 -- [ http://support.microsoft.com/kb/920213 ]
 -- Vulnerability in Microsoft Agent could allow remote code
    execution
11/14/2006 -- [ http://support.microsoft.com/kb/923789 ]
 -- Vulnerabilities in Macromedia Flash Player from Adobe
    could allow remote code execution
11/14/2006 -- [ http://support.microsoft.com/kb/924270 ]
 -- Vulnerability in Workstation Service could allow
    remote code execution
11/14/2006 -- [ http://support.microsoft.com/kb/928088 ]
 -- Vulnerability in Microsoft XML Core Services could
    allow remote code execution
11/14/2006 -- [ http://support.microsoft.com/kb/923980 ]
 -- Vulnerability in the Client Service could allow remote code
    execution
12/12/2006 -- [ http://support.microsoft.com/kb/926247 ]
 -- Vulnerability in Simple Network Management Protocol (SNMP)
    could allow remote code execution
12/12/2006 -- [ http://support.microsoft.com/kb/926255 ]
 -- Vulnerability in Windows could allow elevation of privilege
12/12/2006 -- [ http://support.microsoft.com/kb/923694 ]
 -- Cumulative security update for Outlook Express
12/14/2006 -- [ http://support.microsoft.com/kb/925454 ]
 -- Cumulative Update for Internet Explorer for
    Windows XP Service Pack 2

Media Player:
-------------------
Released: -- [ Web Page Address: ] -- Description:
9/2/2004 -- [ http://go.microsoft.com/fwlink/?LinkId=30984 ]
-- Windows Media Player 10
11/7/2005 -- [ http://support.microsoft.com/kb/902344 ]
 -- Update for WMDRM-enabled Media Players
2/13/2006 -- [ http://support.microsoft.com/kb/911564 ]
 -- Security Update for Windows Media Player Plug-in
4/11/2006 -- [ http://support.microsoft.com/kb/911565 ]
 -- Security Update for Windows Media Player 10 for Windows XP
6/12/2006 -- [ http://support.microsoft.com/kb/917734 ]
 -- Security Update for Windows Media Player 10 for Windows XP
12/12/2006 -- [ http://support.microsoft.com/kb/923689 ]
 -- Vulnerability in Windows Media Format Could Allow Remote
    Code Execution

.NET Framework:
------------------------
Released: -- [ Web Page Address: ] -- Description:
3/30/2004 -- [ http://snipurl.com/10bde ]
 -- Microsoft .NET Framework Version 1.1 Redistributable Package
8/30/2004 -- [ http://support.microsoft.com/kb/885055 ]
 -- Microsoft .NET Framework 1.1 Service Pack 1
2/8/2005 -- [ http://support.microsoft.com/kb/887219 ]
 -- ASP.NET Security Update for Microsoft NET Framework 1.1
    Service Pack 1
3/22/2006 -- [ http://snipurl.com/10bdv ]
 -- Microsoft .NET Framework Version 2.0 Redistributable
     Package (x86)
7/11/2006 -- [ http://support.microsoft.com/kb/917283 ]
 -- NDP 2.0 ASP.Net Security Update
10/10/2006 -- [ http://support.microsoft.com/kb/922770 ]
 -- NET Framework 2.0 SYSTEM.WEB.DLL Security Update

Other Updates:
---------------------
Released: -- [ Web Page Address: ] -- Description:
9/14/2004 -- [ http://support.microsoft.com/kb/873374 ]
 -- Microsoft GDI+ Detection Tool
9/2/2005 -- [ http://support.microsoft.com/kb/893803 ]
 -- Windows Installer 3.1 Redistributable (v2)
10/14/2005 -- [ http://snipurl.com/10bex ]
 -- Windows Media Connect 2.0
11/29/2005 -- [ http://support.microsoft.com/kb/909520 ]
 -- Microsoft Base Smart Card Cryptographic Service Provider
     Package: x86
10/10/2006 -- [ http://support.microsoft.com/kb/890830 ]
 -- Microsoft® Windows® Malicious Software Removal Tool
     - November 2006

Purely OPTIONAL:
----------------------
10/18/2006 -- [ http://www.microsoft.com/windows/ie/downloads/ ]
 -- Internet Explorer 7.0
12/8/2006 -- [ http://support.microsoft.com/kb/925876 ]
 -- Remote Desktop Connection 6.0 client