So I had a trojan virus which was in a svchost.exe so I tried many different solutions. Especially Malware Anti-Malware it detects the virus but when I delete it it shows up again. So I run this application called Combo Fix once it finished IT WONT LET ME OPEN any file any icon anything and when I click on anything it says Illegal operation…
HELP :‘( :’( :‘( :’( :‘( :’( 
Just reboot your system and that should clear up the illegal operation statement you see.
Visit here and attach the logs for OTL, aswMBR and Malwarebytes. http://forum.avast.com/index.php?topic=53253.0
Also look in your C: folder and find ComboFix.txt and attach that as well.