Most MS window users have an antivirus even if it’s a free one. The problem most people face now days is adware, spyware and malware. Most antivirus programs do not check for these problems. A great free program to use is superantispyware. Below is the link to the home website.
Superantispyware

Download the program, update it and clean your computer. This is a great program to use when your computer runs slow.

The Computer Lady