AC was correct, the problem is what your being told.... the problem is the software doing the telling. no doubt it wants you to download and pay for something that will claim to fix all the false positives it is warning you about.
On of the following should fix it.
Adaware free
http://www.download.com/Ad-Aware-2008/3000-802 2_4-10045910.html?part=dl-ad-aware&subj=dl&tag =top5&cdlPid=10903602
Spybot search and destroy
http://www.safer-networking.org/en/mirrors/ind ex.html
or malwarebytes as in huderon link above.
For best results run a full scan with any of the above in safe mode (install the software then restart your computer and keep hitting f8 as soon as it restarts, you should get a menu come up, select safe mode, then when the computer has started into safe mode run a full scan)
start at the first program (adaware) and if that doesn't remove it try the next one.