Three Great Programs for Cleaning your PC

Malwarebytes
Malwarebytes' Anti-Malware is considered to be the next step in the detection and removal of malware. In our product we have compiled a number of new technologies that are designed to quickly detect, destroy, and prevent malware.

Spybot
Application to scan for spyware, adware, hijackers and other malicious software.

CCleaner
CCleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space.