Recently I have been unable to query tables that reside on external databases.
I can open an existing query that queries these tables but I cannot edit the query or create a new query.

I can open the alias and can successfully connect to the database but still cannot begin a new query. I can't see any of the tables in the query mode.

We recently upgraded to Microsoft XP Professional and I am using Paradox 10.

I don't get any error message either.

Any suggestions?

Just a follow up from yesterday.
We recently had the Windows Service Pack 2 installed.