Hi,
You may try creating a new user account with Administrative privileges and check if that helps. To create a new user account
- To open User Accounts, click the Start button, click Control Panel, click User Accounts and Family Safety, and then click User Accounts.
- Click Manage another account. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
- Click Create a new account.
- Type the name you want to give the user account, click an account type, and then click Create Account.
If the new user account works fine then the previous account was corrupt, you may follow the link given below to fix the corrupt user profile.
Fix a corrupted user profile
http://windows.microsoft.com/en-US/Windows7/Fix-a-corrupted-user-profile
Hope this information is helpful.
Amrita M
Microsoft Answers Support Engineer
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