Slow connection to a shared .mdb file over a LAN on some machines only (SOLVED)

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http://serverfault.com – A single client program on each of about 10 computers are sharing a .mdb file on a windows 7 machine. The network is cabled and has a switch. For no obvious reason the connection on 2 of these computers as evidenced by the user experience with the client program has become very slow. The problem arose on the 2 computers simultaneously. The performance on all other computers is unaffected. On the problem computers it is possible to navigate with windows explorer to the folder that stores the database without any undue delay. The only antivirus in operation appears to be windows defender. Diffe (HowTos)