Hi, sorry for such a long time to reply as I was busy with my studies so I didn't care much, living with it. Until I got tired of it, I did a solution which was to delete and create back a account on Windows 7. I think it may be an account error?? I'm still curious of what have caused the problem. In fact, so unlucky that after my desktop had this problem, my laptop had it too!! Its weird. I just want to know what may have caused it. The only thing I did after so long is to delete the account and recreate. Its just a little troublesome as I need to back-up some folders. So to anyone out there who experience this problem, please share your knowledge/solutions here just in case I or anyone else happen to have the problem again.