Do you know whether it's still possible to read the hard drive on your desktop computer? If the drive is still readable, even if Windows will not boot, you should be able to recover the data. This isn't the best forum for helping with that kind of operation. You might try a more general one such as: http://windowssecrets.com/forums/ But for future reference, your Firefox data is stored in your profile folder, which by default is a hidden folder. To make sure you can find it, see this article: http://windows.microsoft.com/en-us/windows/show-hidden-files And then these articles will help you find the old folder and recover data. Please feel free to follow up with more questions on the recommended steps: * [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]] * [[Recovering important data from an old profile]]