pc freezes weird buzzing sound from speakers

hello, i have played this game since beta and about a year ago my pc started freezing up and a weird buzing sound would come out of my speakers. Well i dont remember what i did that fixed it last time but its happening again and im not sure why it would happen again. here are my pc specs

Amd athlon xp 2600
1 gig ram
ati radeon x850xt 256meg latest drivers installed

this problem happend so the first thing i did was update my drivers and it happened again so im not sure whats wrong plz help.

Does it freeze and always has the buzzing sound or it freezes repeating the last sound was played over and over? It could be the heat so try cleaning all fans. If it's not... reinstall windows. I had blue screens for half a year or so... did full format and now not a single one

it sometimes does the buzzing sounds somethimes doesnt