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i really get angry when i see some people using 'star wars' editions of windows for better performance etc (something that is wrong)
Anyway,fighterboss,just download Windows XP (your version,do u remember it?) and press R
If it doesn't work,format it
Though,you should make some upgrades,your PC is a real crap ;P
about the noise,it must be a broken cooler
Maybe it's a HDD problem(noise + broken files) ,keep that in mind too