what model linksys switch, i have 2 24 port dssx24 in my office running our office database as quick as it can run. there is always the obvious update your drivers, also try setting the nics to 100-full just incase ya missed that even though you said you tried everything. check the cables to make sure all 8 pins are good and that nothing is sitting on the cable, especially anything electronic. if you have extra cable go ahead and change it out if you haven't already. any 3com products? set their speed manually. can't think of anything else at the moment but keep fiddlin with it

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we are number one, all others are number two......or lower