With Installation CD/DVD – Initiate Startup Repair or System Restore

• Turn on the computer and press & hold the F8 key
• Select Repair Your Computer from Advanced Boot options
• Hit Enter and choose the preferred language
• Hit Next
• Enter the admin details, if asked
• Now select from System Restore or Startup Repair from the System Recovery options available
• Follow the onscreen instructions to finish this process

With System Restore, you will be able to view the earlier settings, whereas Startup Repair rectifies the errors causing the improper functioning of the Windows 7.

For further information on how to factory reset Windows 7, contact Windows support number.