|"i have a cooler master extreme 600w"|
Not a great unit but it should be able to handle it.
"and what do you mean by remove the entry ??"
Go to Device Manager > Display Adapter. Right click on HD 6450 (or however it's listed), then click
Remove (or Uninstall). I'm not using a Win7 computer right now so I can't give you the exact commands. Once you right click on it, you should be able to figure it out.
EDIT: I found this screenshot: http://3.bp.blogspot.com/-3bhzpBdPe...