You need a Win7 Installation DVd or Repair CD to run Startup Repair
System Repair Disc - Create
If you don't have one, try restarting and tap F8 to access Advanced Boot Options
then look for Repair my Computer, choose it, see if it finds an installation to repair, accept it, if Win7 doesn't start boot back in to run Startup Repair repeatedly from Recovery Tools list. Try also System Restore from the list.
Report back results.
If repairs fail you can copy out your files using DVD or REpair CD: Copy & Paste - in Windows Recovery Console
Then run Factory Recovery from its partition at boot, or using the Disk which you apparently have - did you receive it with computer or make it, and if so are you sure there was only one to make?
What's important is that you BOOT this disk: How to Boot your Computer from a Bootable CD or DVD - Boot to CD
If it won't boot by setting CD drive first to boot in BIOS, try using the one-time BIOS Boot Menu key given on first screen.
If it still won't boot then it apparently won't run or requires files on the HD.
Either order Recovery Disks from manufacturer or find a Win7 installer for your version to clean reinstall following these steps: Perfect Reinstall