Cannot open the Microsoft Jet engine workgroup information file

Hi,
I have 4 linked servers in a SQL Server database.  One of them is another sql server database.  This one works fine.  I have 3 that are Access databases.  Last week I could run a query against these linked servers, but now when I open SQL Server Management Studio I get something like the following:
OLE DB provider "Microsoft.Jet.OLEDB.4.0" for linked server "HRDB" returned message "Cannot open the Microsoft Jet engine workgroup information file.".
Msg 7303, Level 16, State 1, Line 1
Cannot initialize the data source object of OLE DB provider "Microsoft.Jet.OLEDB.4.0" for linked server "HRDB".
What does this error mean?  I've looked at several posts, but none apply to my problem.  I've looked to make sure there wasn't a .ldb open.  Anything else I've missed?
Many thanks,
Mark

The key error is "Cannot open the Microsoft Jet engine workgroup information file".  Here is a suggestion from a AccessMVP.
Are you using ULS (User Level Security) in Access, with a custom workgroup
information file (*.mdw)? If so, you may need to replace this file using a
copy that you should have backed up.
If you have not specifically implemented ULS, then you're still using it,
but you are joined to the file named System.mdw, with username Admin and a
blank password. In this case, which is more likely than the above case I
guessing, your copy of System.mdw may have somehow gotten corrupted. Try
searching your hard drive for this file. For example, my copy is in this
folder:
C:\Documents and Settings\Administrator\Application Data\Microsoft\Access
(Yes, I log on as Administrator on my PC routinely. Bad Tom).
Rename your copy of System.mdw to something else. Then try restarting
Access. Access 2003 will automatically create this file, if you are
permanently joined to System.mdw, and it does not find it during startup.
That should get you a fresh copy.
Good Luck,
Tom Wickerath
Microsoft Access MVP

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