guys, my pc is such a drag i dunno what to do with it :/ !!! lately well, monthly ?? lololol!! my pc has been going BSoD on me and it Freezes then makes a beeping sound, like a time bomb, then restarts!! i honestly dont know how to fix it

!! only thing thats plugged in my pc are the regulars webcam,speakers,keyboard,mouse, modem and company :/ .. i tried asking best buy for help and all they said was "it might be the things u plugged in" soo i decided to change my whole set-up as in new keyboard and such but still with the problem :/!! the geek squad refuses to fix it -_____-", probably caz me and my dad had been going in and out of their store and i think they are sick and tired looking at our faces lol! any1 care to help me

and forgive my grammar/english
PC STAT ... <--
Manufacturer: Hewlett-Packard Company
Model: m8100n
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ 2.80 GHz
Ram: 3GB
System type: 32bit <-- guessing thats bad? o_O"
Vista home premium
500G HH (only used 81.5g caz i r scared it might go emo again lols)