Well, I've taken a rapid look at the crash report.
It seems that your system doesn't handle the start of URL "directly".
Could you please just do a test, open start menu, execute, type an url in the field (like www.google.fr
for exemple) and hit enter.
If it's ok, il will open your default browser (FF3)
If it does't works, you may have a problem with the default action for URL.
OR the Framework try to open URL with a browser that is different of the default browser, but doesn't find the exe.
Have you deleted IE from your system ?
Well, I will install FF3.0, and verify if I can crash Process Manager
Thanks for this bug report !
Rubik's Addicted !