Helo! First what caused the problem: Few days ago the C-partition of the HD-Drive with Win7-OS and firefox-installation crashed due to problems with the clusters (according to error-messages). I tried to fix the problem with chkdsk, win-repair and standard checks but did not work. Win7 starts until the circling balls appear or sometimes until the mouse-coursor on a black screen appears but stays there. The other partitions - containing data - work well as before. I recognised i can get access to the OS-partition by choosing command-prompt in the win7-repair-environment. All files and folders are still there. I installed another HD of the same type (first as single drive) and also installed the same OS and the firefox-browser to search for advice. After that i put the old HD as slave into the PC. All partitions seems ok. but the first one with OS denys access. The diskmanagement under system-control shows no problems with any partition. All partitions are correctly identified and have a properly drive letter. Only access to the first partition wich contains the OS and firefox is always denied. WHAT I TRIED (WANT TO DO): I started the system with the command-prompt without starting win7 (not the Win7-prompt in a window) and i copied the completely profile from the old firefox-installation on the old HD to C: on the new HD with creating all folders by hand and xcopy all files in all folders (E:\Users\(username)\AppData\Roaming\Mozilla\Firefox\Profiles\xxx.default (xxx for the characters/name firefox createt)) to a subfolder on the new C:. Then i choosed this profile by using the ff-Profile-Manager. The name of the profile-folder (and sub-folders) were exactly taken over from the old installation with all files from the old installation on the old HD. BUT WHEN I STARTED FF AGAIN TO AN UNEXPECTED SITUATION, THE PROFILE AND ABOVE ALL THE BOOKMARKS WERE THE SAME LIKE BEFORE (A FEW FROM THE NEW INSTALLATION INSTEAD OF HUNDREDS FROM THE OLD PROFILE). So i ask for advice how i can get the old profile/bookmarks to the new System. Or maybe - if anyone knows - how i could run the old ffox at least once again to save the bookmarks by using the bookmark-backup. (I made a backup but it was too long ago, a lot of new bookmarks were added in the last time.) I would be very thankful for any advice/information to solve the problem. With kind regards System: Desktop-PC (Intel 6600 Dualcore, 2GB Ram, 2x Seagate Barracuda 320GB), Win7 64bit, firefox v37.0.1