Upgrading F14->F15 on x64 - system freezes during cleanup

[Max Pyziur]

Greeting,

I'm upgrading from F14 to F15 on an x64 system. (I've been doing so 
successfully since 2007).

However, on this go-around the screen went blank during "clean-up" and the 
mouse became unresponsive.

Any suggestions would be appreciated.

Thanks.

Max Pyziur
pyz at brama.com