help! - unspecified driver error can't seem to get anything but an error message

I am running CUDA on a new machine and am having real problems calling any CUDA functions.
All I’m trying to do is run the sample code ‘vectorAdd_vc90’ and I get:

cudaSafeCall() Runtime API error : unspecified driver error.

I have tried everything, I have the latest driver update, the latest windows sdk and the latest directx sdk.

Has anyone got any idea how I can go about solving this?

I have an Nvidia FX 1400 which I know is old, but it does support CUDA! I am running Windows XP.

Even the device query program fails because cudaGetDeviceCount doesn’t work. It compiles fine with

Please help!

Looks like I’m not the only one having problems.