How to troubleshoot an XP upgrade of Windows 7 serial number error

Hkey_local_machinesoftwaremicrosoftwindowscurrentversionsetupoobe, and then double-click "Mediabootinstall" in the right window to modify its value to "0" (Figure 1).

Modify the value of Mediabootinstall to 0

Resolve XP upgrade Windows 7 O'Clock serial number error problem save to exit Registry Editor after saving.

Then, enter CMD in the Start menu's search programs and files and open a command Prompt window when you enter.

At this point, run the command: Slmgr/rearm (enter is running when you are finished).

Restart the computer when the system appears in the window shown in Figure 2.

System prompts the command to take effect

Resolve XP Upgrade Windows 7 serial number error problems after restarting and entering the system, right-click Computer on the desktop, select Properties, and then enter a genuine Windows 7 upgrade sequence number in the Open System Properties window (below) to be successful.