Are you in trouble with your installed Windows 7? Looking to repair upgrade install to fix Windows 7? I suggest first try out the System Restore or any other easier option to fix the installed Windows 7. A clean reinstall is not easy. Moreover, you insist to preserve your user accounts, data, programs and system drivers. The only way you could do this is to Repair Install to Fix Windows 7.
Here are steps you need to follow o Repair install Windows 7

Step 1

Start the Windows 7 and log on to administrator account

Step 2

Disable the 3rd party antivirus, firewall or any such security program. These may interfere with the repair upgrade installation of Windows 7.

Step 3

Load the Windows 7 installation DVD into the DVD drive. Now click on the Run Setup.exe option in the Autoplay window from within the currently installed Windows 7.

Step 4

Next click on the Install Now button to start the installation

Step 5

Uncheck the I want to help make Windows installation better box. Following this click on the Go online to get the latest updates for installation option.

Step 6

Windows 7 will search online to install any available installation updates.

Step 7

Look for the I accept the license terms box and check it. Then click on Next.

Step 8

Follow it by clicking on the Upgrade option. Now the installation of Windows 7 will begin.

Step 9

After the final restart a blank screen appears

Step 10

Type in your Windows 7 product key number

Step 11

First uncheck the Automatically activate Windows when I’m online box at the bottom. After this click on the Next button.

Step 12

Now click on the Use recommended settings.

Step 13

Choose your Time Zone. Set the time and date setting and click on the Next button.

Step 14

Click on the option for your computer’s location to select the correct network location type setting that has to be applied for the location.

Step 16

Now Windows 7 prepares your desktop to startup

Step 17

It’s not over yet. Now, ensure that you are not missing any user file.

Step 18

In case some users files are missing copy them from the hidden protected operating system – C:\$INPLACE.~TR and C:\WINDOWS.~Q folders.

Step 19

Run the Disk Cleanup. For this click on the Clean up system file button. After this check the Files discarded by Windows upgrade box.

Step 20

Refresh the Windows Experience Index (WEI) score.

Finally you are done with the repair work. Activate the Windows 7 and enjoy.