CAN SOMEONE PLS HELP ME OUT????

I HAVE A SONY VAIO PCG-505TR AND EVERY TIME YOU TURN IT ON YOU GET THR ERROR MESSAGE NTLDR IS MISSING.IT WON'T LET YOU DO ANYTHING.I'VE TRIED BOOT DISK AND SINCE IT USES AN EXTERNAL BACKPACK
CD-ROM THAT DOESN'T HELP.HOW CAN I GET MY LAPTOP BACK TO NORMAL???????? I NEED IT FOR SCHOOL.THANKS
BRYAN <img src="confused.gif" border="0">

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