I have used Firefox Portable for a while (on a usb drive and in a truecrypt volume. Suddenly a few days ago, they stopped working. When I try to start them, nothing happens (no splash screen, nothing comes up). No error messages come up. If I look at task manager however, Firefox Portable is there and taking all the cpu it can (usually 98 or 99%). If I wait, nothing happens (its not just slow starting). I have to kill it or it just goes on forever. This is on WinXP, with all updates (who knows, the updates may have killed it - I can't think of any other changes). I have reinstalled, and tried also running off the hard drive with the exact results.
Any ideas whats going wrong?