get a svc host error u have to reinstall ur operating system or do a systemrestore. Download kaspersky from here Goodluck, Dont forget to rate me as more...
click on tool's folder options and the select view hidden or system files, If you did then please verify according to djnick989's suggestions, do is try another antivirus like AVG FREE or you can restore to a previous date before you had the virus, where you more...
sounds like best solution is to restore windows to when it worked ok. this will unravel the chaos-ed registry and make it appear new again.
you do have systemrestore enabled, right?
open START->ALL PROGRAMS->ACCESSORIES->SYSTEM TOOLS->SYSTEMRESTORE and find a date more...