Hi AhHello,
· Are you able to boot to the desktop?
· When exactly do you receive the error message?
· Have you made any changes on the computer prior to the issue?
If you are not able to boot to the desktop then I would suggest you to perform startup repair to fix the issue.
Refer these articles for more information on startup repair:
Startup Repair
http://windows.microsoft.com/en-us/windows7/products/features/startup-repair
Startup Repair: frequently asked questions
http://windows.microsoft.com/en-US/windows7/Startup-Repair-frequently-asked-questions
Hope this information helps.