My parents computer is currently experiencing some problems, namely countless pop-up ads and taking forever to boot up. My mom was told to get a program called "Spybot" which she installed shortly thereafter. Low and behold, Spybot is telling her that there are 45 "parasites" on her computer. In order to get rid of these little buggers, we need to pay somewhere around forty dollars for the complete version of Spybot. Are there any other free alternatives of spyware that I can download for her to eliminate the problem? Also, if she was to purchase the complete version of Spybot, would I have to eliminate each of the 45 parasites individually, or would it simply take a few clicks of the mouse and the program will do it automatically? Edit: I realize that erasing the entire hard drive and starting over from scratch is an option for some people. Unfortunately, my mother isn't one of them.