Can't connect, unable to open desktop, error=5

[Zeno <zen...@gm...>]

Trying out TightVNC for the first time. Both maches are Win7. I can't
seem to connect, I forwarded the ports and it gets past authentication
but then dies with this log:

Fri Jan 29 14:41:15 2010
vncSockConnect.cpp:	started socket connection thread
Fri Jan 29 14:41:23 2010
vncSockConnect.cpp:	accepted connection from 24.97.153.8
vncClient.cpp:	client connected : 24.97.153.8 (id 1)
vncClient.cpp:	performing VNC authentication
Fri Jan 29 14:41:25 2010
WallpaperUtils.cpp:	KillActiveDesktop
WallpaperUtils.cpp:	unable to fetch Active Desktop options:80004001
Fri Jan 29 14:41:26 2010
VideoDriver.cpp:	No 'Mirage Driver' or 'DemoForge Mirage Driver' found.
VideoDriver.cpp:	vncVideoDriver::CheckVersion: can't create DC on ""
VideoDriver.cpp:	vncVideoDriver::MapSharedbuffers: can't create DC on ""
VideoDriver.cpp:	No 'Mirage Driver' or 'DemoForge Mirage Driver' found.
vncDesktop.cpp:	failed to activate video driver interface
Fri Jan 29 14:41:27 2010
vncDesktop.cpp:	display resolution or desktop changed.
vncService.cpp:	unable to open desktop, error=5
vncDesktop.cpp:	failed to re-start desktop server.
vncService.cpp:	SelectHDESK failed to close old desktop 54, error=170
vncClient.cpp:	client disconnected : 24.97.153.8 (id 1)
vncServer.cpp:	deleting desktop server
vncService.cpp:	SelectHDESK failed to close old desktop 54, error=170
WallpaperUtils.cpp:	unable to fetch Active Desktop options:80004001