Some times an account can end corrupting itself. Try running a "sfc/ scannow" using cmd (make sure you run as admin). If that fails try this Fix corrupt user file. Windows 7
Basically if that doesn't fix it copy all user data to a new account.
My Computer
At a glance
Windows 7 Professional (x64/SP1) /Linux Mint 16Intel i5-3570k 3.40 GHz @ 4.6 GHz8GB (2133MHz) DDR3Asus GTX560 Ti (Nvidia)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
GIGABYTE Rig (Custom)
OS
Windows 7 Professional (x64/SP1) /Linux Mint 16
CPU
Intel i5-3570k 3.40 GHz @ 4.6 GHz
Motherboard
GIGABYTE Z77X-D3H
Memory
8GB (2133MHz) DDR3
Graphics Card(s)
Asus GTX560 Ti (Nvidia)
Monitor(s) Displays
HP 23", Acer 19" and a Dell 17"
Screen Resolution
1080p, 1440x900 and 1280x1024
Hard Drives
Sandisk Extreme 120GB (SSD), WD 2TB green and 4 other HDDs