Half Life 2 Episode 1

Question

I have the above card, which HL2 recommended me to get the latest driver for. Did that, and updated to DirectX 10... and now HL2 crashes whenever I try to launch it - citing exception error 0xc0000005 in the error report. I have completed the direct draw and direct 3d 7,8 and 9 tests with no problems using run-> dxdiag. Help!