When instructed to restart your TMG Server during Access Manager Web component installation or setup, be sure to follow any instructions that appear on the screen.
Also, the net commands help to ensure that the Metabase does not become corrupted following an installation. Consider the following commands, which provide good ways to stop and start the TMG Server:
net stop fwsrv
net start fwsrv
For more information, see your TMG Server documentation.