|Find a friend with a windows 7 computer and create a bootable windows recovery disc. |
Boot to that and try the automatic repair.
If that fails, boot back into your recovery disc, go to the command window.
chkdsk C: /r /x
So that check disk may take a while. You can stop here and try to boot, but if you want to be sure that your windows files are not corrupted continue with a system file check
sfc /scannow /offbootdir=C:\windows\ /offwindir=C:\
Now try to boot.