Just had a problem where our thin nComputing L300 clients went blank.
The Multipoint Server 2011 said that nComputing was corrupt.
I went to reinstall nComputing but I got an error Failed install: HydraTS/HbHydrats getlasterror 0x2
The problem was that the filewall was preventing the install. I turned the filewall off, the install went fine, picked up the old configuration and licencing and the thin clients came back up.