shut down probs help

well im don't know much about pc's so please be kind.
here are my problems.
1 my pc wont shut down its just restarts.
2 my pc is running a lot slower than when i first got it (only 4 months old)
3 when i right click on some icons on my desktop the screen refreshes and the icons only come back after 3 seconds or so without giveing my the right click option.

ive been doing alot of downloading p2p if thats any help
my specs athlon 64 3400
1 ghz ram
2 200 duel hard drives
thatks for taking the time to read my long winded explaination.
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  1. Quote:
    ive been doing alot of downloading p2p if thats any help


    Stop it.

    Then run Ad-Aware, Spybot S&D, and a good virus checker.
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