Why my computer is so messed up? I have to run anti this anf that everyday?

I have windows defender, firewall, AVG antivirus. Also I have free version of Superantispyware and Ad-aware 2007.

The last two I have to run them everyday, Ad-aware finds average of 130 infections everyday! Only my dad and I use this computer, I took a look to his account settings and everything seems to be in order. It just took me around an hour to get the computer to work, had to reboot twice and is still ridiculously slow, but if I reboot again is start from the beginning. The slow can't be memory related because the harddrive memory is mostly unused.

This is really making me miserable, I am studying computer science and I can't run the compiler, thus can't do homework.

Any idea what is wrong with this machine?

Why my computer is so messed up? I have to run anti this anf that everyday?anti virus software

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