Hello,
I would recommend you restating the Windows 2008 machine.
and work on the steps provided in the Article: http://www.symantec.com/docs/TECH95608
Secondly, you have to Migrate the SEPM from the older version of 11.0.6200 to 12.1.1000 and then to 12.1.1101.401
Symantec Endpoint Protection 12.1.1101.401 (RU1 MP1) can migrate seamlessly over the Symantec Endpoint Protection 12.1.1000.157 (RU1)
Hope that helps!!