Help with 3dmark vantage and HD 3450

every time i try to benchmark my new pc
it freezes when loading the test or the screen flickers back to my desktop and in the bar below i get a message saying "display drivers have failed but are back online"

what should i do??
 
i'm using windows vista business
amd phenom 8450
2x2gig musking 800mhz
ECS Black edition 780g
asus hd3450
525watt psu
 
Your system specs look fine... 3DMark Vantage may just not be compatible with your system. Why trying to Benchmark anyway?
 
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