When I log in, it asked me if I'm a new user, or open an existing file--instead of opening the last file that I used. This has happened twice. When I look for the backup files which should be on

/Quickenbackup--which is where they have always been--the folder does not exist. I did not do anything to erase files or anything--it just happened spontaneously.
Fortunately, I found a Quicken file 6 months old and reactivated that file and backed it up. The next day, the same thing happened. I searched for that file and it was nowhere to be found on any drive--C or D drive.
What's going on? I see other people have had this problem...