what power supply r u using?
from your hardwares specs, i can c that is need a bigger power .
i think at least u should have a true 400watts PSU.
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AMD Athlon 64x2 4000+
2GB Kingston DDRII667Mhz
MSI K9Neo-F
MSI 256MB GeForce8500GT
Western Digital 160GB SATAII HDD
Maxtor 80GB 8M ATA133 HDD
LG 4163B DVDRW
17" Samsung 793Dfx Monitor
Win XP Pro