Sorry that is my fault. No need to run as Admin as you're running XP. Thought it was Vista.

Either way now that you've posted I would prefer you run this tool.

Download MBRCheck.exe to your desktop
Double click on MBRCheck.exe to run it
It will show a black screen with some data on it
Click on the black C:\ in the upper left hand corner of the black screen
Choose Edit > Select All > Press Enter to copy the data to your clip board
Press Enter again to close MBRCheck
Now open up notepad or wordpad and paste the data in (press Control+V)

Post the results in your reply