WHILE BURNING CD'S ONE DAY MY LAPTOP WENT TO THE BLUE SCREEN I RESTARTED IT SEVERAL TIMES AND IT CONTINUED TO GO TO THE BLUE SCREEN. A FRIEND TOLD ME I NEEDED TO REINSTALL WINDOWS XP. NOONE I KNEW HAD A DISC SO ANOTHER FRIEND GAVE ME A WINDOWS XP BLACK DISC AND SAID IT WOULD BE FINE. I INSTALLED IT AND NOW I HAVE 2 OPERATING SYSTEMS AND IT REQUIRES ME TO CHOOSE ONE OF THEM AT THE STARTUP EVERYTIME. I DON'T KNOW HOW TO REMOVE ONE OF THEM OR IF THAT IS EVEN WHAT I SHOULD DO. AND IF IT IS, HOW CAN I KEEP ALL MY MUSIC, PICTURES, VIDEOS AND OTHER PERSONAL THINGS?