Hi Jonathan,
Please follow the methods and check if it works fine.
Method 1:
Let’s check if you are able to perform system restore from safe mode.
Refer to the links
Start your computer in safe mode
System Restore
http://windows.microsoft.com/en-IN/windows7/products/features/system-restore
If it works fine in safe mode, perform clean boot.
Refer to the link:
How to perform a clean boot to troubleshoot a problem in Windows 8, Windows 7, or Windows Vista
http://support.microsoft.com/kb/929135/en-us
NOTE: After troubleshooting, revert the computer to start as usual (Refer to “How to reset the computer to start as usual after clean boot troubleshooting” from the link mentioned above)
Method 2:
Follow the steps to check if Volume Shadow Copy service is started.
a. Press Windows key + R
b. In the run box, type services.msc and press enter.
c. Right click in if Volume Shadow Copy service and click on start.
d. Click on OK.
For any Windows related issues please feel free to contact us and we will be glad to help