The standard two extra programs are -
spybot search and destroy - � http://download.cnet.com/Spybot-Search-amp-Destroy/3000-8022_4-10122137.html
lavasoft/adaware - http://www.softpedia.com/get/Internet/Popup-Ad-Spyware-Blockers/Ad-Aware-2007.shtml
Free security software (antivirus and spyware and stuff) from Microsoft -
http://www.microsoft.com/security_essentials/default.aspx?mkt=en-us
http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
Uniblue is rubbish they just want your money. I �ve heard (but don �t know) that registry cleaners can mess up your computer, so be careful. The software above are not registry cleaners, but should clean your computer.
For a free firewall try-
http://download.cnet.com/Online-Armor-Free/3000-10435_4-10426782.html
p.s. I am not a computer expert, so I may be wrong (but I don �t think so). There are many other programs that I don�t know about.