Creo Personal Edition no start on Win7 64bit Business

Installation completed without problem. I then got the error messgae with the router. So I removed the unnecessary router settings from IE (I don't use IE and it had some old settings stored). Then I get the splash screen and immediately a Windows error message stating that the software stopped responding and Windows is looking for a solution to the problem.

I tried the regserve trick, Made sure Net 2.0 is installed. All to no avail. I also uninstalled and re-installed. It goes to the above screen immediately.

Any ideas?

ST