Problem connecting windows 7 computer to ezxs55w switch

Question

I've got a simple wired network with a ezxs55w switch uplinked to a befsr41 router.  My win 2K system and a canon network printer work fine on the switch, but a new dell running windows 7 does not make a connection when plugged into the switch, but it does work when plugged into a port the router.  When plugged into the switch there are no lights on the computer nic.  The switch seems to recognize something as all three leds for the port come on but turn off immediately and then repeat the process every few seconds.  The cables and ports all work ok with the win2k computer.  Ideas?
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Answer 1

my first try - didn't work, also 100/half dp failed.  10 works either way.  this is a faithful but v2 hardware switch - as we get older the timing seems to go... Clearly the move to gigabit transmission nic's is showing problems with timing for auto sensing in earlier switches etc. Another of those things that would always work passes on.  Good thing in w-7 is you can change settings, click ok, and immediately see by the leds if it works or not.  Just for interest it would be neat to see what the difference (in a very condensed form)  between the router ports and the switch port logic/timing is for us geeks.  Meanwhile my multi-gigahertz quad core boat anchor sees the world at 80's speed, but there's a birthday coming up -