@MrEasy, Coimbra:
Thanks for your information.
If i do the workaround with deleting the installation manually and cleaning the windows registry, I guess I have to reassign all settings for the guest system again, right?
I opened a BugTicket for that installer issue.
http://www.virtualbox.org/ticket/3659Maybe you could confirm the installation issue there?
EDIT:
That workaround seem to be doing the thing for me:
viewtopic.php?f=6&t=16242&p=68449&hilit=beta2+2.2.0#p68449Removing VirtualBox program folder and renaming the VB-folders in documents and settings
Installing the VB2.1.4. After that updating to 2.2.0 worked fine! Copied the old XML-files to the actual .VirtualBox folder to restore my old settings.
Had not to touch the registry manually.
It seems to be a problem with the 2.2.0beta2 installation, not the VB2.2.0 release.