Aspect ratio not right.

[Scream]

The aspect ratios work like a charm for newer movies.
BUT!
When I try to watch an older XviD movie, the movie overlaps. about an inch from bottom, and one inch from the right side, are not shown.
(In full screen mode).
So basically, I change aspect ratios, untill the image is right(no long faces), and after I exit full screen, I see parts of the image, that I'm prived of in full screen mode.

My monitor is a 15.4" lcd monitor, HD(laptop). My screen resolution is 1280x800px.

My OS is Windows XP pro, sp3. Bsplayer PRO v2.50 build 1012.
This was a problem for me with other versions of BSPlayer too.

[Scream]

Later add:

I've forgot to specify that the aspect ratio is just fine, if i run the program right after installation.

But if a movie requires a a smaller width, and an exact height, when I click the "A" button(to change the aspect ratio), it never gets it right(tried with 4:3, 16.9,anamorphic,original), and as a result, the movie is overlapping my screen, so I can't see a part of the movie.
Which, as you can imagine, it's quite frustrating.

I must mention that I have no problems with the aspect ratios in other players.
Just in bsplayer.