wavelab 8.5 doesn´t launch

I bought and installed wavelab 8.5 on my labtop and on my stationary computer.
I use Windows 7 on both. It works fine on the labtop but not on the stationary PC .During opening ,wavelab stops after creating the “audiofile” bluebar at the top of the screen -after that nothing happens.I try to uninstall and empty all wavelab contens in regedit but it doesn´t help.The USB- licenser is connected.
Before I bought 8.5 I tried to install wavelab 5 which didn´t work -it could only play the audiofiles.
Does anybody have an idea why I can´t open wavelab?
Thanks in advance.