Graphics card not detected by DXDIAG

Hi all,

I am new to this forum so please excuse my technical understanding.

I have encountered this problem that my graphics card ATI RADEON HD 4670
is not detected by dxdiag.I am using xp 64bit though I have reinstalled drivers many times but the problem seems to persists.I have even ran 64bit dxdiag but still it shows no G card.

Thanks in advance .

Rgds
Saurabh