Display Drivers and coprocessor

I tried updating my NVIDIA drivers and ended up messing my pc's resolution. The downloaded file failed to install and now I'm stuck with a resolution not intended for my widescreen monitor.n I tried to install the driver through device manager and this error message popped out:

upload_2014-4-18_7-20-43.png

Apart from that, I have yellow exclamation marks next to my coprocessor, display and ther devices.

upload_2014-4-18_7-21-51.png

I'm not completely comtech savvy so please, can you tell me what should I do? Thanks and have a great day ahead!
 

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