Can't find selected song/2nd Monitor

[singalong]

Sorry but using Vista. Version 3.316 worked fine. Backed up KMA files from external hard drive, then when I searched for a file (name, artist, discID) the box came up and said can't find selected file. Directory letter is still the same "F:/". Rebuilt database/songbase but nothing. Second problem is I lost my ability to send to a second monitor. Have been using 3.316 since I downloaded hoster. Tried update to 4.06, made all the computer changes, hoster came up but still unable to find song/and 2nd monitor still won't work. I am not a computer whiz but I followed the directions and followed the user manual. Should I just delete everything and start from scratch or is it just something I'm overlooking. Thanks