Urgent:Explorer is not opening


I have Windows 7 and Ubuntu in my system. I have hibernated Windows 7. After starting ubuntu, I think I have modified some files from the windows drive. And I have hibernated Ubuntu also.

Now when I try to login to Windows, Its accepting the password but its not opening the EXplorer. It just shows the mouse pointer. Explorer is not opening by itself.

I have opened the explorer explicitly from the task-manager using New Task.
Then My Desktop opens up. But unable to open My Computer...

Please help..

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