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How do I fix this damn computer?

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I own a dell computer with windows xp... Every day it seems like something else goes wrong I now can't right click or copy/paste in internet explorer, I can't use either ctrl in most programs Internet options in control panel jsut pops up and goes away within seconds meaning I also cant get my tool bars on ie back (file, view, etc) and the bubble that usually pops up at the top to block pop ups (but the one you need to download anything from adobe [also not working suddenly] to itunes [so much for the new ipod] I'm honestly ging crazy here.. Every time I turn around a new problem arises. Can someone please tell me what the hell is wrong here? And what I need to do to fix it?