This is nothing more thatn any other software can provide.
Go to the pro's. Stick with the ones you trust. Buy a subscription to AVG, <-- The best or McAfee and many others. Of course you will also need the complete protection. Look at Spyware Doctor, Registry Mechanic and many others that will help and keep you running the way your computer should. Or. Buy a Mac:(
But what I am saying is NOTHING IS FREE.
A good start is AVG and PCTOOLS.com.