Fedora 15 & GNOME 3 Crash.

Some PCs have issues when installed with Fedora 15 and GNOME 3 as its desktop manager.  On my Compaq Presario R3000 labptop, I was unable to login due to crash in subsystem (gnome-shell).  When I tried to login, it display a message something like "unrecovered ...".

The problem is that GNOME3 is not stable enough to be run on some machines/video cards with 3D (perhaps Nouveau driver unable to execute 100% of the required GNOME3 features?).  Some people in the Internet said that by executing the following command it should fix the issue, but not in my case:

gsettings set org.gnome.desktop.session session-name gnome-fallback

After googling around, I found a good solution:

sudo rpm --nodeps -e gnome-shell

This has fixed my GNOME problem.  I could now login to the fallback mode (GNOME2-like)