System recovery options can help you repair Windows if a serious error occurs. To use system recovery options, you'll need a Windows installation disc or access to the recovery options provided by your computer manufacturer. If you don't have either of those choices, you can create a system repair disc to access system recovery options.
Open Backup and Restore by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking Backup and Restore.
In the left pane, click Create a system repair disc, and then follow the steps.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
If you're prompted to insert a Windows installation disc, it means that the files needed to create the system repair disc can't be found on your computer. Insert a Windows 7 installation disc.
Insert the system repair disc into your CD or DVD drive.
Restart your computer using the computer's power button.
If prompted, press any key to start the computer from the system repair disc.
If your computer isn't configured to start from a CD or DVD, check the information that came with your computer. You might need to change your computer's BIOS settings.
Choose your language settings, and then click Next.
Select a recovery option, and then click Next.
Print these instructions and keep them in a safe location with your system repair disc.