Open a run command and type in:
msconfig    click [OK] on the system configuration windows click on start up
tab and uncheck the check box for TrayApp.

PRB: Error 1706 "No Valid Source Could Be Found" When Installing MSI File
from Removable Media
http://support.microsoft.com/?kbid=299803

Description of the Windows Installer CleanUp Utility
http://support.microsoft.com/default.aspx?scid=kb;en-us;290301

If the above didn't help have a look in the Event Viewer and send us the
error messages you will see
there in your next post:
Open a Notepad, customize or minimize to the taskbar as you will need it
later for this step to copy the error message on it.
Open a run command and type in:
eventvwr.msc click [OK] you will get the Event viewer control Panel.
click on each of these:
Application
System
Security
Look in the right Pane/window for error message with red (X) or Yellow
exclamation mark /!\ , double click each one to get more info about the
causer.
On the Event error properties message you will see:
Up Arrow
Down arrow
Two pages
Click on the two pages to copy the error message then bring up the Notepad
you opened earlier and right click on the first line and select Paste from
the list, this will paste the error message on a Notepad.
Please don't duplicate the error message one of each kind will be sufficient.
HOW TO: View and Manage Event Logs in Event Viewer in Windows XP
http://support.microsoft.com/kb/308427/en-us

Please we need just the error messages with Red (X) and don't repeat the
error, just one of each kind and post them back in your next post.
HTH.
nass
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http://www.nasstec.co.uk