If Windows 7 does not boot up or boots up with problems, use the Windows 7 system repair disk to troubleshoot and fix the issue. The system repair disk allows you to boot up Windows and provides several options for repairing a damaged operating system.
To use the Windows 7 repair disk, insert the disc in your computer's DVD drive, and reboot the computer. Once the system comes back up, you should get a message that says, “Press any key to boot from DVD.” Press any key on the computer’s keyboard while this message is up.
You can use several recovery tools to fix your computer. The Recovery Wizard presents you with a set of options including Startup Repair, which fixes software problems that prevent a computer from starting correctly. The second option, System Restore, restores Windows 7 to an earlier point in time. The third option is System Image Recovery, which recovers a computer by using a system image that was created during a system backup.
The last two options are Windows Memory Diagnostic and Command Prompt. The Windows Memory Diagnostic tools checks a computer for memory hardware errors, while the Command Prompt option opens a Command Prompt window.