Try creating another (Admin) account and see if you can change things there.
If so, then your user profile is likely to be corrupted.
Try this to see if you can fix things:
- DISM/SFC (see quote box below)
- System Restore to a point before the problem started happening
- RESET with the Keep My Files option
- RESET with the Remove Everything option (Backup your stuff first - as this will remove everything!)
Here's the DISM/SFC stuff:
Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt). Press Enter after each one:
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHealth
FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.
From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx
You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption.
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