5.0 Cannot continue install, installer says Parallels is still running...

...And it's not. I just got the 5.0 upgrade and I'm trying to install. during the installation "preparation" step, is says:
"Conflicting Applications

To continue the installation, quit the following applications:"

Below this message is a Window with "Parallels Desktop for Mac"

The Continue button is greyed-out, so I cannot move forward. And I can't even upgrade. i've tried restarting the computer and everything. I don't understand why it says that Parallels is running.

 

i got the same Problem and it work when i restart MAC OS X. Maybe its the way!