By "fixed laptops" do you mean wired?
Because if the laptops are wireless, this is likely the issue. You would need to reposition your wireless router, or look for competing WiFi networks in the vicinity sharing the same WiFi channel. You can use an application such as
inSSIDer to sniff out an unoccupied channel.
If wired, still most likely a network problem. Test the access time to the database on your main computer or server (running the AC database) on the client laptop (using the AC Utilities), and compare it to the time to connect to the database when AC Utilities is run on the main computer. Sometimes there is a network IP address conflict -- assigning fixed IP addresses to the main computer and clients may help.
I expect you will soon get some excellent replies from our board gurus -- stay tuned!
