У меня была такая же фишка при работе с DBASE IV, настрой Панель управления - Администрирование - Источники данных (ODBC), должно пройти.
(Я тоже думал из-за MDAC'a....)
Bugs: Couldn't Find Installable ISAM
When you try to export/import data from Excel, dBase, Text or some other file type, you might get this error message.
A missing file or corrupt registry entry are the usual causes behind this error. Sometimes, a typical Office Setup does not install these drivers by default. Re-run the Setup program, and manually select the individual drivers under the Data Access options. If any of the driver files were missing, they should be copied and registered by the Setup program.
However, in a few cases, this does not get rid of the error message. If the driver files are already present on the hard drive, the registry entries could be corrupt.
First try registering the appropriate dll with RegSvr32 (sample steps <bugs0007.htm>. If this doesn't work, then try running the setup with some command line arguments:
Setup /y /r
If you still experience the same error message, try completely uninstalling Access. Then, search for these files on your hard drive, and rename them.
Msexcl35.dll (Excel) Mstext35.dll (Text)
Msxbse35.dll (dBase) Msxbse35.dll (FoxPro)
Now, re-install Access.
Сейчас у меня не пахал DBASE на одной из машин, скопировал Msxbse35.dll, зарегистрировал (regsvr32 Msxbse35.dll)- поехало!