Non-destructive reinstall of Windows Vista and 7 | www.winhelp.us

If nothing from previous troubleshooting articles helped to get Windows into proper working condition, there is a way to repair Windows Vista or 7 without losing all your data, documents, settings and installed programs and drivers. This type of reinstallation is also called repair install or in-place upgrade.

Source: Non-destructive reinstall of Windows Vista and 7 | www.winhelp.us