I would consider it a requirement to install “1” real-time Antispyware program. Real-time means it is always running and “actively scanning your computer, as opposed to a passive online virus scanner which needs to be manually started.
NEVER install more than “1” real-time active antispyware program. There are many antivirus vendors to choose from, but I have only chosen to include the only “paid” versions I would ever use (Malwarebytes & Superantispyware, both which are active versions), although they both offer free passive versions as well, and “2” free versions (Spywareblaster and Spybot), both of which I like and have personally used.
Caution: Installing more than “1″ active antispyware program can cause Windows to become unstable, but you can safely install and run several “passive” antispyware programs.
SpywareBlaster provides passive protection for both Internet Explorer and Firefox internet browsers by essentially blocking known bad websites, active-x controls and cookies.
Download and Install SpywareBlaster
Spybot Search & Destroy detects and removes spyware and provides passive protection for Internet Explorer.
Download and Install Spybot Search & Destroy
MalwareBytes Free detects and removes spyware.
Download and Install Malwarebytes Anti-Malware
SUPERAntiSpyware Free detects and removes spyware.
Download and Install SUPERAntiSpyware
Ninite is a 3rd party website used to silently install multiple freeware and trial programs using your Internet browser.
Download Programs using Ninite.com