Spyware is not considered viruses because, in general, he seeks to virus programs (but only infects the computer with more or less aware of the user) or to attack other computers (ex. to spread via e mail). He is considered a threat to privacy.
Spyware is the name given to a category of software, usually attached to free software (games, free programs changed files, pornographic chat programs, etc…) Which is used to collect marketing data (by analyzing what search sites user, for example: fashion, shoes, tennis clubs, etc.) and to submit any ads that user according to excerpts of marketing spyware.

How to remove, clean and fix Windows

1. Update your Windows

Update your Windows with the latest patches for security or you can use a utility programmer which can help you to upgrade your Windows system.

2. Run a full scan with antispyware softwares.

Here you can find a list with free antispyware software