Just a comment about the machines...
1.6ghz Intel Pentium 4 with 256meg ram and a large hard drive.
I have talked to the techy guy for the network. He has disabled the DBF, FPT, CDX, DBC, DCX, DBT from the list of filetypes to check with the virus checker on both the fileserver and the workstation.
He is also NOT using Norton Antivirus.