I've been facing the same problem as mentioned in one of the threads related to deletion of spools.exe, after I heroically deleted the spools.exe file from my System32\drivers folder.
I use a Windows Xp Home Edition with SP2 and do not have anti virus solutions installed.
I was searching for a key for a software yesterday when I accidentally ran the file to land in hell.
Also I am a newbie so didn't know where to begin from.
Apologies and Thanks in advance.