Hello All, surprised these two are not in the list.
CCleaner Clears out Temp and cookies and many other things.
http://www.ccleaner.com
A.V.G. Anti-Virus
http://free.grisoft.com/doc/1
And also theres Winpatrol
http://www.winpatrol.com/plus.html
Read all about what they do at the websites.
GEP