diskeeper will defragment your harddrive: this means it will put all data that belongs to 1 file put sequentially on the disk instead of spreaded over your hard disk's clusters.
spyware doctor will remove spyware from your computer. spyware are programs that are installed unwillingly and without your knowledge, mostly they collect data about something which is considered to be private (for example the websites you visit).
A bad thing about spyware removers: Most of the time, the so called spyware programs will also remove the internet-cookies from your pc though because this is also used to store personal data (for example this forum uses a cookie to store your name and password so that you will log in next time automatically when you visit). Of course when these cookies are removed the site won't remember you and you will have to log in again with your username and password...
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