Home Network lock up's and slow

Ok
I have three computers connected with a D-Link 10/100
4 port switch,WinXP Pro on all three computers with
C-Net 10/100 NIC cards in all machines. Main computer
Set up with ICS. Asus a7v133-E,Asus A7V 133,PC Chips
Are the motherboards used. Now to the problem.
The 2 computers in the back can connect and run at 100
Mbps to each other, if I leave the main computer set
At 100 Mbps it freezes and is very slow if it works at
All. Now if I set it at 10 Mbps it will communicate and
Run just fine. I have tried 3 different switches and
hubs and swapped the NIC's around in the computers
And even tried different PCI slots in the main computer
I have had the cables tested, and they test just fine.
Any ideas on what could be wrong?
Thanks in advance.

Rock out with your AMD out

I had a co-workers brother,who installs and
troubleshoots network cable,use his $4000.00 U.S.
tester.That's what he said the cost was.I am going
to pick up a new pre-made cable this weekend or
take the cable to the shop I deal with and hook it up
and see how it works on their network and go from there.

Rock out with your AMD out

It was running next to my cable,so I
pulled it out to get tested and just
let it run on the floor.No change either way.
Thanks for the ideas

Rock out with your AMD out