profile corrupted - copying files to new profile didn't help

Help!!

When I launched Mozilla (1.2 on XP) this morning, my browser went to 
mozilla.org instead of my home page, and the mail client wanted to 
create a new default profile for me. No access to my mail folders, 
although I see them in my Application Date\Mozilla\Profiles directories.

I attempted the solution in the FAQ, to create a new profile, copy my 
old profile files into it, and relaunch. The new profile acted the same 
way as my old one.

I tried deleting my *.msf files in the new profile (though I figured 
that couldn't be it, since my browser settings were gone, too -- except 
for my bookmarks). No luck.

Does anyone have any alternate solutions? It's fairly urgent.