Not sure if this will work, but what you can try doing if you have the OS disk is:
1) put the OS disk in the cd drive
2) restart the computer, and immediatly start tapping the F12 key, until you see the boot device menu pop up
3) your going to choose the cd rom option (IDE Cd rom, or usb etc) and hit enter, and then hit the spacebar when you see the "press any key to continue" screen
4) Windows should then start loading files
5)You should then get the windows start up screen, where you have the option of hitting enter to reinstal windows or hitting R to open recovery console, hit r, choose the corresponding number for your OS if applicable. Now it might also give you the option to chose a user, you need to choose administrator, if it asks for a password either put it in, or just hit enter if you never created on
6) now, type in chkdsk /p (there is a space there) Takes about 5 min to scan
7) now, type chkdsk /r (this will take anywhere from an hour, to an hour and a half, you'll see the progression bar go up and down as it's fixing errors)
8) when chkdsk is complete, type FIXBOOT, and select yes for rewriting the boot
9) Finally, type FIXMBR, again choose yes
Non of this will delete files, or anything of the sort, your just correcting windows errors, and creating new boot files. Once all this is done, take out cd and restart computer.
Unsolved 
