Update failed numerous times. Uninstalled FF using Control Panel. Followed instructions to delete the Mozilla folder from AppData/Local/Mozilla. Then the "Folder in Use" prompt comes up and I have to cancel the delete. Folder was created 4/8/2011, but I can't find the folder using the search command. Can't install a fresh install of Firefox 18. Using Windows 7 64-bit. I no longer have FireFox on my system that I can see.