Crash (Score 1, Informative)

I've been using the pre alpha nightlies, then the alpha then betas and finally tried RC1

This crashed as soon as it started up

RC2 shows a web page but crashes as soon as I click on anything...

I'm using XP which is up to date with all patches. I know most tricks on how to get FF working... but I am stumpted as to why both RCs are so fucked on my computer. I've had to revert back to FF2 and I miss the URL bar and tagging :-(