system
18
Hi again jazzymina,
How the hell should I understand what files are normal and what which are infected. Avast didn´t get rid off the crap that infects my computer, I was just worried that there was another stupid virus.
I am deeply sorry if I am not a computerexpert like you are…
We understand your not a computer expert, so don’t worry, ill try to clear things up 
C:\WINDOWS\System32[b]svchost.exe[/b] is a normal running/windows process what is in your C:\WINDOWS\System32, the W32.Welchia.Worm which you speak of exploits an unpatched windows system, and for it to be the W32.Welchia.Worm (worm) it would have to be outside of the C:\WINDOWS\System32 folder (in the Temp folder etc).
So in this case it is fine. 
Hope i have had things clearer for you.
–lee