I installed windows 7 on a seperate partition with xp and it installed fine but when I used the loader from daz my computer doesn't start up anymore. there's a flashing underscore at the top left of the screen after it loads the screen with the option to go to bios. I tried holding the r and c key but didn't work. I put in the windows 7 disc but it doesn't let me get to the screen where I can choose the repair option. any way I can fix this?