Windows Update damaged my project

Hello!

I have an ASP.NET project in Visual C# with some web
services, which communicates with databases (both SQL and
Access). Recently I installed Jet 4.0 Service pack 7 for
XP (Q282010) from Windows Update and since then I can't
get the OleDBDataAdapter.Fill method to work for
AccessDatabases (SQLClient namespace works fine). It
returns error of type:

OleDbException (0x80004005): "Åtgärden avbröts" (swedish,
means that the task was interrupted).
at System.Data.OleDb.OleDbConnection.ProcessResults(Int32
hr)
System.Data.OleDb.OleDbConnection.InitializeProvider()
....

I tried to make a new webform in that project and added
the connection and adapter with help of Visual C# but get
the same error. The odd thing is that when I create a new
project and add the same kind of connection, adapter and
code, it works fine.

I had to make the Update installation twice since it
failed first time (it just disappeared without any error
messages). During the first installation I had the
project open in VS and closed it before the installation
failed. Perhaps it was affected in some way. I've tried
to uninstall the SP but still get the same error.

Any suggestions would be appreciated.

Thanks!
Miro