Problem with ISAM

Hi folks

I have a classic ASP page which lists and accesses CSV files in a specific folder using the following connection string:

Provider=Microsoft.Jet.OLEDB.4.0;Data Source=<FOLDER PATH>="text;HDR=Yes;FMT=Delimited";

But I keep getting the following error message.

Microsoft JET Database Engine error '80004005'
Could not find installable ISAM.

This page has been working fine for the past 3 months and it hasnt been modified but this error has just started to appear.

I've tried a number of different ways to fix this including the registry fix from Microsoft, re-installation of MDAC 2.8, installed Jet 4.0 sp1 but still not getting anywhere.

Hope someone can help.

Thanks

Steven