25 Steps to a Faster PC
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6. Bring your antivirus program up to date and do a full virus scan of your computer.

Bring your antivirus program up to date and regularly do a full virus scan of your computer. 

Check your antivirus program as it will tell you when the last full scan was done.  You may be surprised to see it is not what you thought, but was last done months ago. 

If you don't have an up to date antivirus program, and don't want to pay for a new one, there are several high quality free ones available to the private consumer.  They are: Grissoft's AVG, H+BEDV's Antivr, Alwil's Free avast! 4 Home Edition.

WinHki Anti-Virus -

Also try WinHki Anti-Virus, which acts as a supplement to normal Anti-virus program like above.  WinHki calculates the checksums ( a mathematical calculation extremely difficult to fool) of your files on initialization.  After that, whenever a virus changes a file it will be flagged by WinHki because the checksum will change.