invalid page fault in kernel32.dll when starting program

Hey, I'm working on a PC for a dental office, and when I
start this database program called "dentrix" on this
particular PC, it starts fine and everything, but when I
click on a button that is used to open another executable
(dentrix image) that is like a plug-in for this
application, I get an invalid page fault error.

This is the first time I've worked on a PC for this
office, and this program, and its driving me nuts. I've
completely formatted and reinstalled windws 98se and
apps, and still get the same problem. I've swapped out
the memory. I originally thought it was because of the
video driver because this denimg program uses a video
capture card to capture pictures, but I've downloaded the
appropriate drivers and everything for this ATI AIW 128
to work with video for windows and stuff so it should
work. Here's the complete text of the error message:

DENIMG caused an invalid page fault in
module KERNEL32.DLL at 0177:bff76840.
Registers:
EAX=007401d0 CS=0177 EIP=bff76840 EFLGS=00010246
EBX=007401d0 SS=017f ESP=00740000 EBP=00740014
ECX=00740098 DS=017f ESI=81682a50 FS=401f
EDX=bff76855 ES=017f EDI=007400c0 GS=0000
Bytes at CS:EIP:
ff 75 0c ff 75 08 ff 55 18 83 c4 10 64 8f 05 00
Stack dump:
007400dc 00740098 007401d0 bff76855 007401d0 007400a8
bff87fe9 007400c0 007401d0 007400dc 00740098 bff76855
00740288 81682a50 0083f5f4 00000000


thanks for any help,

Will