Q2006 Deluxe dies on start up - Invalid Op in QWMAIN.DLL

Running Win 98 SE with all security patches. I have tried uninstalling q2006, using cleanup tool, reinstalling in different folder, installing in Safe Mode, running in Safe Mode, called Live Phone support, tried installing direct from hard drive, installing from hard drive in Safe Mode. All efforts end in a "bad DLL call". Q2006 runs on other Win98 SE system so problem has to be in an old DLL or some such. Tried uninstalling old peripherals, tried uninstalling optical mouse Still no joy. Looked for duplicate DLLs, looked for stale DLLs - none found but problem still occurs. This problem is making my head hurt.

Thanks to all that have previous tried to help. Text from error dump:

QW caused an exception c06d007eH in module QWMAIN.DLL at

0167:102c0cc7. Registers: EAX72f2d4 CS
67 EIP2c0cc7 EFLGS000246 EBX000000 SS
6f ESP72f278 EBP72f2c8 ECXÁ631500 DS
6f ESI2ef62c FS37 EDX95b284 ES
6f EDI000000 GS00 Bytes at CS:EIP:
8b 45 d8 e9 f3 00 00 00 57 ff 75 e8 ff 15 94 71 Stack dump:
00000000 0196ca69 bfc05591 00000024 102ef62c 1031db9c 102e9820
00000001 102f19b0 00000000 00000000 00000485 00000000 000003fe
1032f5d8 2072f2f8