Spyware can slow down your computer, prevent Internet access, and cause pop-ups and shutdowns. Below is free software that the experts use to remove spyware for good. 
1. SpyBot Search & Destroy – updates and removes latest spyware
2. Windows Defender – automated to update and run scans nightly
3. Ad-Aware – Performs thorough registry and folder scan for pop-ups & adware
4. CWShredder – Remove annoying Internet browser hijackers and redirectors
Which software should you use? Well, they all contain different ways to remove malicious content, and some programs remove spyware that others do not. Typically, using Spybot and Windows Defender in combination seem to perform an exhaustive removal of spyware.