If you have some Windows Installation media, see if you can boot from the CD/DVD and get into Recovery Console to run a full chkdsk. Hopefully it's just some file system corruption that it can repair and find the bootstrap files again. Some info/links on using chkdsk across different platforms/methods:
http://www.brazil-help.com/chkdsk.htm
Some specific info for trying to recover for Win7 from Microsoft:
http://social.answers.microsoft.com/Forums/en-US/w7repair/thread/85848ecf-e8dc-4625-98c3-74b434f7241a
Raist
Edited, Oct 3rd 2010 8:53pm by BDHERTZER