new pc build has gremlins

thanks to all the hexus members who helped me choose the parts which are -

ASUS P5K-E/WIFI-AP AiLifestyle Series P35 Socket 775 Socket eSATA 8 channel Audio ATX Motherboard
520W Corsair HX Series Modular PSU
Intel Core 2 Duo E6750, S775, 2.66
2GB (2x1GB) CorsairTwinX XMS2, DDR2
768Mb BFG Technology 8800GTX OC2, P
1 x Western Digital WD5000AAKS 500GB SATA II 7200RPM 16MB Cache - OEM
Samsung SH-S203/BEBN 20x DVD±R, 16x
Case - Antec P182 Advanced PERFORMANCE ONE

Vista runs fine but when ever I try to install xp or run a game (bioshock) the computer just turns off after afew mins. What would cause that?

OK it just crashed in vista too while watching a HD apple trailer. This a graphics card prob?

Just installed Asus PC Probe and my cpu is at 58 celsius... that cant be right.

hi there, i've just finished my build this weekend. Before i upgraded i played Bio too and my comp crashed. It could well be that your rig is getting to hot and you need more coolers for it. My problem i found out was that i needed to update my motherboard driver after that it worked fine.

does it crash or simply switch off. If it switches off it could be that as said above the temp are to high and the threashhold ur bios has set means it will switch off once its reached to a certain temp. Check for bios updates and also make sure ur cooling is fitted properly and let us know wot temps u get on load and on idle..