WebPI never get past initial window

Hi,

I have installed WebPI on other computers and never had a problem.

Now - on Windows 7 Ultimate 64bit (6Gb) it seems the install never get past the initial screen "Web Platform Installer 4.5" - it just hangs (I have tried reinstalling / restarting etc.)

The logfile "%temp%\webpi_launcher.txt" has not been created.

Eventlog does not tell me anything.

Any suggestions?

Thanks

Bjorn