BSplayer no sound playing vob files

[polysynaptic]

hi!

i searched the forum. and couldn't find any help. so i wanted to ask. initially my system is as follows:

HP nx8220 laptop.
MS Windows XP Professional SP3 [all updates done with clean install]
BS Player 2.32.975
K-Lite Mega Codec Pack (last update)

problem:

bsplayer plays video of vob files but no sound at all.

extra info:

0. ) i have no hardware issues.
1. ) media player classic can play them appropriately with its internal codecs.
2. ) while playing the vob files with bsplayer (wich gives only video without audio), i right click and navigate in menus, "Options" -> "Filters". and only three items are present:

"Cyberlink something..."
"Source"
"Advanced"

3. ) when i click on advanced its again those two items (except advanced).

so...

i would appreciate any help. and thanx in advance.

regards...

ps: AC3 filter is loaded with K-Lite pack.