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We need more information to help you with your issue, so please try to answer the following questions:
1. How long did your camera work without issues?
2. Normally Windows updates your camera driver, but you can check it in Programs and Features. If it is installed, please uninstall it and install it manually, this is the link https://software.intel.com/en-us/intel-realsense-sdk/download.
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My Sr300 stopped working today after I updated my version of the SDK from 2016 R2 to 2016 R3. I don't know if that was related but that's when it happened. After removing the camera from the Connected Device list and uninstalling/reinstalling the DCM (and a restart or two) it started working again.
When I looked in device manager while it was not working, I could see the RGB and depth camera entries but there was nothing for the virtual driver. Once that up and running again, everything worked as before.