Interrupting an installation is always a delicate process. We are investigating. In the meantime can you send us: C:\Documents and Settings\All Users\NoMachine\var\log\
and also the output of C:\Program Files\NoMachine\bin\nxserver.exe –status
After which try to execute:
C:\Program\ Files\NoMachine\bin\nxserver.exe –shutdown
Check in the Task Manager if there are any nx processes, and if there are any, kill them and try uninstalling NoMachine again via “Add and Remove Programs” panel.