Hello @Anonymous
I would recommend scan your disk and system for errors. Right click on your hard drive - choose Tools - then the Error Checking Check now... button - then Start.
Another thign to try is a system scan. It involves running the command sfc /scannow from a command promt with Admin. rights. If you are unsure how to do this go to link below:
https://support.microsoft.com/en-us/kb/929833
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Kind Regards,
BJ.C
Technical Support Specialist