Ok update on my problems.
1: I uninstalled WB6 again, rebooted.
2: Installed WB5, rebooted and then uninstalled it, rebooted.
3: Then I ran a registry clean(TweakNow Registry Cleaner), which found some leftover files from wb5, which I deleted.(wonder why not everything is deleted..?)
4: Ran defrag, then rebooted again.
5: Installed WB6 once again (this time in the old folder of wb5) and voila - it worked.

Sorry purrball - I didn't use your link, since I didn't see it until after I got it to work.
But thanks for it anyway.. glad it works for other

NB! I might have to add, that I did all installing and Uninstalling from within Stardock Central.