Fast User Switching / Terminal Services / Error 127

I installed SP2 today and have lost FUS ability. I've tried Kelly's
reg fixes, but to no avail. I went into Services tools and tried to
start FUS and I get an "Error 1068: The dependency service or group
failed to start". I know that Terminal Services is a dependancy and
it was not started. I tried to start manually and I get an "Error 127:
The specified prodecure could not be found". RPC and RPC Locator
services are started. I would really like to continue to use FUS -
any ideas to fix this problem? Thanks...

Spencer