I would recommend running AVG and Kaspersky (both) on your computer. As ryno stated, the other options would be to restore from an earlier state (which might be risky if there is malware it may have deliberately infected this portion of your computer).
The other option would be to save your personal files to a USB or CD, reinstall your computer, and then re-scan the files on the USB/CD (as they may be infected) before moving them back to your new computer.
After that, make sure you rotate your passwords (don't re-use any passwords from when you machine was compromised), keep one of the free antivirus programs updated, and practice safe browsing habits (don't click on links in emails - always type them into the URL bar, if a pop-up says your computer is infected don't click on/install anything, force-quit your browser, don't ever give out your password, don't install software unless it's from a trusted source and needed, etc...).