[Tutorial] How to Keep your System Safe + Running Smoothly

[MasterZuFu]

I would also suggest:

Malware Bytes: http://download.cnet.com/Malwarebytes-An...04572.html
Hijack This: http://downloads.malwareremoval.com/HijackThis.exe
WinPatrol: http://www.winpatrol.com/download.html

Also:

If someone sends you an email, please take the time to find out if they really are who they say they are (it's SOOOO easy to phish someone who isn't paying attention, and I can make just about any email look real, even in the header).