The "installable ISAM" problem is a pain--it shows up with ADO Access provider too. My guess: If you installed Acc97 first and then the other apps one of the files was overwritten by other newer apps and Acc97 is looking for the older version.
Have you tried the MS Knowledge Base? I don't have URL, but there are some good pages with info on file/dll versions for various Access-related items (seach "Jet Service Packs" or "Access dll version", etc.). The table below came from one of those pages and lists the file versions that change w/ service packs alone. :-0
Also: You might post this question in one of the OS forums, where the System Engineers are.
[tt]
Date Release File Version Size
Jet 4.0 SP3 Release 1 msjet40.dll 4.00.2927.4 1,495,312
Jet 4.0 SP3 Release 1 msrepl40.dll 4.00.2927.2 557,056
Jet 4.0 SP3 Release 1 dao360.dll 3.60.2927.4 557,328
Jet 4.0 SP3 Release 1 Jetcomp.exe 4.0.1532.0 65,536
Jet 4.0 SP3 Release 1 msjetoledb40.dll 4.00.2927.2 348,342
Jet 4.0 SP3 Release 1 msjtes40.dll 4.00.2927.6 237,840
Jet 4.0 SP3 Release 1 msrd3x40.dll 4.00.2927.4 315,664
Jet 4.0 SP3 Release 1 mstext40.dll 4.00.2927.6 241,936
11-Oct-99 Jet 4.0 SP3 Release 2 dao360.dll 03.60.2927.4 557,328
11-Oct-99 Jet 4.0 SP3 Release 2 JETCOMP.exe 4.0.1532.0 65,536
11-Oct-99 Jet 4.0 SP3 Release 2 msexcl40.dll 4.00.2927.9 323,856
11-Oct-99 Jet 4.0 SP3 Release 2 msjet40.dll 4.00.2927.4 1,495,312
11-Oct-99 Jet 4.0 SP3 Release 2 msjetoledb40.dll 4.00.2927.2 348,432
11-Oct-99 Jet 4.0 SP3 Release 2 msjtes40.dll 4.00.2927.6 237,840
11-Oct-99 Jet 4.0 SP3 Release 2 msltus40.dll 4.00.2927.9 209,168
11-Oct-99 Jet 4.0 SP3 Release 2 msrd3x40.dll 4.00.2927.4 315,664
11-Oct-99 Jet 4.0 SP3 Release 2 msrepl40.dll 4.00.2927.2 553,232
11-Oct-99 Jet 4.0 SP3 Release 2 mstext40.dll 4.00.2927.11 250,128
26-Apr-00 Jet 4.0 SP4 Release 3 dao360.dll 3.60.3714.5 557,328
26-Apr-00 Jet 4.0 SP4 Release 3 JETCOMP.exe 4.0.1532.0 65,536
26-Apr-00 Jet 4.0 SP4 Release 3 msexcl40.dll 4.0.3714.0 323,856
26-Apr-00 Jet 4.0 SP4 Release 3 msjet40.dll 4.0.3714.7 1,499,408
26-Apr-00 Jet 4.0 SP4 Release 3 msjetoledb40.dll 4.0.3714.0 348,432
26-Apr-00 Jet 4.0 SP4 Release 3 msjtes40.dll 4.0.3714.5 241,936
26-Apr-00 Jet 4.0 SP4 Release 3 msltus40.dll 4.0.3714.0 213,264
26-Apr-00 Jet 4.0 SP4 Release 3 msrd3x40.dll 4.0.3714.0 315,664
26-Apr-00 Jet 4.0 SP4 Release 3 msrepl40.dll 4.0.3714.0 553,232
26-Apr-00 Jet 4.0 SP4 Release 3 msrpfs40.dll 4.0.3714.0 74,000
26-Apr-00 Jet 4.0 SP4 Release 3 mstext40.dll 4.0.3714.5 250,128
26-Apr-00 Jet 4.0 SP4 Release 3 mstrai40.exe 4.0.3714.0 37,136
26-Apr-00 Jet 4.0 SP4 Release 3 mstran40.exe 4.0.3714.0 45,328
26-Oct-00 Jet 4.0 SP5 Release 4 dao360.dll 3.60.3714.5 557,328
26-Oct-00 Jet 4.0 SP5 Release 4 msexch40.dll 4.0.4331.7 512,272
26-Oct-00 Jet 4.0 SP5 Release 4 msexcl40.dll 4.0.4331.3 319,760
26-Oct-00 Jet 4.0 SP5 Release 4 msjet40.dll 4.0.4431.1 1,503,504
26-Oct-00 Jet 4.0 SP5 Release 4 msjetoledb40.dll 4.0.4331.4 348,432
26-Oct-00 Jet 4.0 SP5 Release 4 msjtes40.dll 4.0.4229.0 241,936
26-Oct-00 Jet 4.0 SP5 Release 4 msltus40.dll 4.0.4331.3 213,264
26-Oct-00 Jet 4.0 SP5 Release 4 mspbde40.dll 4.0.4331.6 348,432
26-Oct-00 Jet 4.0 SP5 Release 4 msrd3x40.dll 4.0.4325.0 315,664
26-Oct-00 Jet 4.0 SP5 Release 4 msrepl40.dll 4.0.4331.0 553,232
26-Oct-00 Jet 4.0 SP5 Release 4 msrpfs40.dll 4.0.4314.0 74,000
26-Oct-00 Jet 4.0 SP5 Release 4 mstext40.dll 4.0.4331.5 254,224
26-Oct-00 Jet 4.0 SP5 Release 4 mstrai40.exe 4.0.3714.0 37,136
26-Oct-00 Jet 4.0 SP5 Release 4 mstran40.exe 4.0.3714.0 45,328
26-Oct-00 Jet 4.0 SP5 Release 4 msxbde40.dll 4.0.4331.6 344,336
[/tt]
Jeffrey R. Roberts
Insight Data Consulting
Access, SQL Server, & Oracle Development