[CentOS] Installed CentOS 5 today, question about an error I'm getting

So I did a fresh install today. Decided to go ahead and upgrade.
Everything seems okay save for three problems.

#1 - I get a message during boot saying that an Intel microcode update
didn't work. Something about not being able to find /proc/microcode.

#2 - I can't use the Firefox extension HTML Parser. Anyone use this.

#3 - Off and on GDM crashes and I get dropped into a prompt.

Any ideas?

Preston