System slowing down possibley cause of worm??

[chkinstu]

I recently downloaded a file and it contained a worm named "vbs/gedza.a". I ran avg 7 and it said that it was deleted. i thought i was ok until i noticed my system was running slow than before. most of the time when i look at windows task manager it shows my cpu usage between 80 and 100% when i am not even running anything. i have done multiple checks with avg and it comes up with nothing but this seems wierd that my system is running slower. can someone please tell what to do?

[PrntRhd]

Here is a link on that one from Symantec (http://securityresponse.symantec.com/avcenter/venc/data/vbs.gaggle.d.html)

[delete]

Just some suggestions :
Is AVG set to scan "all files" ? Cause that slows my pc down somewhat. I just set it to scan the usual/common files.
And mb download/run TCPview to see if there's some weird activity on some ports.