CUDA 7.0 and 7.5 issue with GTX 980 and 355.60 driver

Hi all; please, help me.
After update my GTX 980 drivers to 355.60 version no releases of CUDA works (from 6.0 to 7.5).
(Instead, with 344.60 drivers CUDA releases (6.0 and 6.5 for GTX9xx) works well).

the error occurs whenever I try to use the memory, even indirectly. For example, the code:

cudaEvent_t start;

erase the error :

“Invalid floating point operation”

I’m working in Visual Studio 2012 professional, to build a dll; my SO is Windows 7 64 bit;

Does anyone know if there is any incompatibility with this configuration (GTX 980 + Driver 355.60 + CUDA 6.0/6.5 for GTX 9xx/7.0/7.5)?
Someone would know how I could solve?

Please, somebody help me: I do not know what to do.
Thank you.