Parallels Desktop and 10.5

I just went from 10.4 to 10.5 with archive and install. I also backed up the entire 10.4 hard disk to an external drive. All programs are working fine, except Parallels Desktop! I'm getting an error pop-up message upon opening the program, saying that Parallels Desktop cannot locate ONE of its drivers so it cannot open. It is the latest Parallels Desktop version with Windows Vista Ultimate..... all was working fine on 10.4.

Any ideas without re-installation which I can't do because I don't have the Vista CD's.

Thanks!

Here is the exact message:

Parallels Desktop is unable to operate properly since it cannot communicate with one of its drivers. Try to restart the application to overcome this issue. If restart doesn't help, re-install Parallels Desktop. Note that Parallels drivers require a short time to be properly started and initialized. So you may need to wait a minute before trying to launch the application.

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Its probably because you installed it using Tiger, and now that you have leopard you will probably have to reinstall Parrallels

Anyone know for sure?

Someone must know???