The timeout you changed is the connection timeout, so it won't affect
timeouts caused by long-running queries. Depending on what connection
library you're using (ODBC, ADO), you should be able to change the general
timeout value, but I have no idea how - perhaps an Access group might give
more help.

In ay event, if the timeouts occur during different queries, or the same
queries with different parameters, you'll probably have to try to identify
the problem queries more exactly - Profiler would be a good place to start.

Simon