virtualbox-error -1908

[Alfred JILKA]

Before you go ahead and think: one more lazy guy, RTFM, I'd like to tell 
you: I did.
And even some more pages on the net.
My system: AMD 64, 2GB Ram, free diskspace to play around: 180GB
Virtualbox is Version 1.5.6_OSE (from adept_manager installed)

Suggestions were:
reinstall the *generic driver. -> no go
modify the vboxdrv, restart the system. -> no go
run vboxdrv with option "setup". This one was removed, as stated inside 
the script. -> no joy
Tried to look into the logs. There are none...
Looked into dmesg. No errors, even no mention of vboxdrv or similar.

Downloaded 1.6.0 and ran the file, but it stopped with the really 
intelligent errormessage:
(After telling me, that the archive is ok)
"there were errors encountered which might prevent VB from running. 
Please correct them"
At least to that effect.

Any more ideas ?
TIA, Alfred