signed cuda drivers why are the windows cuda drivers not digitally signed

I am trying to get the IT department in our company to automatically rollout the CUDA drivers on all our XP x64 machines (around 20 rigs). They simply could not do it because the drivers are not digitally signed and that there is no way (we know of) they could silently ignore the driver signing warning dialogue. my question is twofold:

-> Has anybody solved this problem before ?
-> To the NVIDIA guys : is there any reason why the drivers are not digitally signed ?

Cheers,
Ali

There are WHQL-certified derivers with CUDA support. Try downloading latest driver from NVIDIA website (not from CUDA page) – it is CUDA-enabled and signed.