Any ideas why I get a GPF when I try to play AVIs and Mpegs. I get the following everytime:

RUNDLL32 caused a stack fault in module unknown at 0000:b00ce3a1.
Registers:
EAX=c1f68000 CS=0157 EIP=b00ce3a1 EFLGS=00010206
EBX=0000c200 SS=015f ESP=00c6ec9c EBP=00000000
ECX=00c6efd8 DS=015f ESI=c1fff000 FS=4187
EDX=00c6efd8 ES=015f EDI=c1fff000 GS=0000
Bytes at CS:EIP:
8b 75 18 8b 58 50 85 f6 74 45 3b 5e 08 72 40 8b
Stack dump:
00c6efd8 c1fff000 802ed25c 0000c200 b00cdd5f c1fff000 00000000 83721ce4 00c6ef00 0000c200 802ed25c bff7bd62 c1fff000 00000104 c11cbef0 00100000


They worked fine on my old PC, but not on the new PIII 500Mhz with Win 95 release 2. Its consistent as a few machines were bought at the same time and we all get the same fault. I have no ideas where to start looking - and our tech support are stumped.

Thanks in advance

Jason