I think I know what happened. I remember getting a Firefox update yesterday. Then seeing a pop-up with Mozilla files. I didn't know what to do, thought they were old or remnant files and clicked on delete. Today FF was gone. I retrieved a lot of files from the recycle bin but FF still didn't work. Firefox.exe is gone. In Programs and Features it looks as if FF is still there, 121 Mb, latest version, installed yesterday.
Just now I tried to do a system restore point but it failed several times. I uninstalled my AV program BullGuard, deactivated MBAM, still nothing. The error code is 0x80070005. I read posts by people with the same error code and they tried so much to get the system restore to work but without any luck. Can anyone help?
The only problem I have with just installing FF anew is that I'd have lost my History. Does anyone know a way to retrieve my History? Which folder/file that might contain?