Cuda on windows 10: Cudasetdevice cannot find cuda device


I recently updated my Sony Vaio laptop to windows 10. Updated Nvidia drivers and installed cuda 7.5. Installation went through smoothly (Visual studio 10). I can compile the simple testcuda program. But when I go to run it says,
Cudasetdevice failed. Cannot find any cuda capable device. It was working fine in 8.1. Any ideas?
Graphics card is : Geforce GT 640M

Thanks for your help,


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Following forum answer fixed it:

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