Copy out your files now using Win7 DVD or Repair CD: Copy & Paste - in Windows Recovery Console
Try booting into Safe Mode.
Make sure Win7 partition or its 100mb System Reserved boot partition (preferred) are marked Active: Partition - Mark as Active
System Repair Disc - Create
Then run any offered repair from the DVD Repair console or Repair CD. If it doesn't offer or repair fails, boot back into Recovery Options list to run Startup Repair up to 3 separate times with reboots: Startup Repair - Run 3 Separate Times
If no OS is found to repair, open a Command line from Recovery Options, type:
Now try the Repairs.
System Restore should be automated by Win7. iF not, try running it from the Recovery Tools list on DVD/CD.
Try running System File Checker from the DVD/Repair CD Command Prompt: SFC /SCANNOW : Run in Command Prompt at Boot
If no joy, run the Factory Recovery partition from boot (preferred) or from disks made at setup. Or you can go completely clean by wiping the HD to re-install windows 7