Personal Video Database

Firstly, I must apologise for the long absence, but health issues ( a curse of ageing) have been a bit of a problem. Back to the problem. I have tried the suggestions, but realise I didn't explain things very well. On my PC, in a file under "My Documents" I have a folder " Personal Video Database" In this folder I have some 430 entries with a file type of .pvd. If I open (startup PVD, I get a listing of some 250 movies, not 430. If I pick a title that I know I have, but is not displayed, & double click on the entry in the PC, it causes a new opening of PVD with the "missing" entry displayed. It doesn't stay with the same file, but appears to be random. I have reinstalled PVD with no improvement. I have tried it on 2 different PCs. I am running Windows 7 Ultimate, i5 680 CPU, 4gb memory.

G'day, I hope this is not a silly question, but I am confused by the fact that movies seem to go missing from the PVD screen, but are still in the database. I have not fiddled with any filters yet, as I am totally new to this. I really love the program & have friends starting to use it, however, a couple of times I have looked up the screen for a movie I know I have & its not there. If I double click it in the database, it opens a new PVD screen with the "missing" movie there. Am I doing something wrong (or silly)? Regards, Gwandad
I forgot to add, my PVD screen shows 286 movies listed, but my database has 362, so I am curious to know where the other 76 have gone?