first , hi to all forumer ^^"

jus now i'm using
amd althonxp 1800+ (default is 11.5x133 = 1535) (palomino core proc)(default vcore=1.744v)
MSI K7N2 Delta-L mainboard
256mb kingston value ram
radeon 9550xt
Thermaltake Volcano 11 HSF

i tried to oc 11.5X135 / 11.5x140 / 11.5x145 can successfully boot up pc and load to windows , but pc sure will hang when gaming/msn/surfing net

i oso tried 11.5x150 and above , cannot boot up pc as well T.T

if i run at default speed , pc can open 24/7 w/o any prob
and the temp oso no prob as all
at default speed , cpu full load = Around 52Celcius

here my question
1.hows come i oc to 11.5x135 pc will hang oso lolx ?
2.is it vcore problem ?
3.hows can i oc this lousy pc ?

tq v much....