Firefox won't open because of my bookmarks

My firefox was working normally and great yesterday morning, but when I got home from work it wouldn't open. I looked online and it said to make a new profile, so I did, and when I use that one, it works. When I use the previous one with my bookmarks in, it doesn't. I tried to move the bookmarks into the new profile, but then it wont work again, so I had to make yet another one to get onto this website. If I click on firefox in one of the other profiles it just wont open. This is really frustrating as the bookmarks are very important, and I can't remember all of them, and I don't want to lose them.
== Operating system ==
Vista

You can delete prefs.js or the files lightweighttheme-footer and lightweighttheme-header in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] to remove the persona and revert to the default theme.
Are there any extensions installed in that profile (Tools > Add-ons > Extensions)?
Some programs install extensions globally for each profile automatically.

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