SCOM 2007 installation error “Invalid Management Group name”

Just a small tip.. I was trying to install SCOM 2007 SP1 for PRO integration. I used an old server which used to be SCOM server before we uninstall it.

When I tried to install System Center Operations Manager 2007 I saw the following error when I enter the management group name.

“Invalid Management Group name”

 This problem occurs when the Management Group name is:

 -Empty of Null

-Leading or Trailing spaces

 -Already exists on this computer

-Contains special characters.   The Management Group name should not contain following special characters:
^@)~(:!`#%\*+$|,&&=’["]/<.{;?>}

To continue setup, go back and change the Management Group name.

Actually the uninstall process was fine and did not reflect any errors in the system. I am not SCOM expert but from the error looks like the OS still keeping some information about the old SCOM servers in somewhere. I searched in the registry for the servers and I found some keys still not removed from the old installation.

To solve this problem Just delete the following registry path HKLM\Software\Microsoft\Microsoft Operations Manager

Double check if still there any files under your Program Files for the old installation.. if there remove it and restart the server.