Download Spybot Search & Destroy and Malwarebytes' these two programs can remove A LOT of malware.
Malware can disable your Virus protection...
Run Spybot First (by itself) AFTER you update it first.. (Check For Problems)
(Super Antispyware & Spyware Doctor are also good scanners)
Then press the Fix Selected Problems button...
Then you may need to restart your computer...
Next run Malwarebytes (after you get on your desktop) after you update it, do a FULL SCAN...
IMPORTANT: one very important trick in order to get to a working computer is to boot into Safe Mode With Networking... Press F8 (constantly) after you see the Bios Picture when you first start up your computer, select Safe Mode With Networking and press Enter.. (log onto your account)
The reason this works is, the minimal services are loaded, and often many services & processes are not loaded (the ones secretly placed in startup too), so you may get much better performance in safe mode and increase your chances of removing the malware & viruses off of your computer..
One of The Best Windows Online Scanner (meaning you run it through the browser) on the Internet is called One Care Live Safety Scanner and it can be found here at: onecare.live.com (This catches what most other scanners DO NOT!) (ESET is great too!)
The Best Virus Scanner (You must install your old one first ALWAYS) is Microsoft Security Essentials which can be found here. http://www.microsoft.com/security/pc-security/mse.aspx
***Remember the more scans you use, the great chance you have of removing ALL of the problems!***