over 2 years ago - AndrewT - Direct link
From your description I'm quite sure this is a Windows or hardware fault.

You could try this Windows repair tool:

Use the System File Checker tool to repair missing or corrupted system files

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista. support.microsoft.com support.microsoft.com
If that doesn't help, I fear your next step is a Windows Reset or even wipe and reinstall.

Sorry about that!