Henning,

The process itself is a system component.
<http://www.liutilities.com/products/wintaskspro/processlibrary/spoolsv/>

It may point to a malware infection however.
<http://securityresponse.symantec.com/avcenter/venc/data/backdoor.ciadoor.b.html>
http://www.dslreports.com/forum/remark%2C8734856

How current is your virus protection?  Try one or more of these free online
virus scans, which should complement your current protection:
<http://www.bitdefender.com/scan/license.php>
<http://www.pandasoftware.com/activescan>
<http://www.ravantivirus.com/scan/>
<http://security.symantec.com/ssc/home.asp>
<http://housecall.trendmicro.com/housecall/start_corp.asp>

Now check for, and learn to defend against, additional problems - adware,
crapware, spyware.

Start by downloading each of the following additional free tools:
AdAware <http://www.lavasoftusa.com/>
HijackThis <http://www.majorgeeks.com/download.php?det=3155>
LSP-Fix <http://www.cexx.org/lspfix.htm>
WinsockXPFix <http://www.spychecker.com/program/winsockxpfix.html>
Spybot S&D <http://www.safer-networking.org/index.php?page=download>
Stinger <http://us.mcafee.com/virusInfo/default.asp?id=stinger>

Create a separate folder for HijackThis, such as C:\HijackThis - copy the
downloaded file there.  AdAware and Spybot S&D have install routines - run them.
The other downloaded programs can be copied into, and run from, any convenient
folder.

First, run Stinger.  Have it remove any problems found.

Next, run AdAware.  First update it, configure for full scan
(<http://forums.spywareinfo.com/index.php?showtopic=11150>), then scan.  When
scanning finishes, remove all Critical Objects found.

Next, run Spybot S&D.  First update it, then run a scan ("Check for problems").
Trust Spybot, and delete everything ("Fix Problems") that is displayed in Red.

Then, run HijackThis ("Scan").  Do NOT make any changes immediately.  Save the
HJT Log.
<http://forums.spywareinfo.com/index.php?showtopic=227>
<http://forums.spywareinfo.com/index.php?showtopic=11150>

Finally, have your HJT log interpreted by experts at one or more of the
following security forums (and please post a link to your forum posts, here):
Aumha: <http://forum.aumha.org/index.php>
Net-Integration: <http://forums.net-integration.net/>
Spyware Info: <http://forums.spywareinfo.com/>
Spyware Warrior: <http://spywarewarrior.com/index.php>
Tom Coyote: <http://forums.tomcoyote.org/>

If removal of any spyware affects your ability to access the internet (some
spyware builds itself into the network software, and its removal may damage your
network), run LSP-Fix and / or WinsockXPFIx.