http://support.microsoft.com/default.aspx?scid=KB;en-us;q283165

1) Go to "Start" menu -> Click "Run" -> Type "Regedt32.exe" -> Click "OK"
2) Go to this Registry Key HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-08002bE10318}\00 10\Ndi\params\MaxFra
Note: The 0010 may be different for you depending on how many pieces of hardware you have installed, but it will be one of those 00 numbers
3) Double click on "max" and change the value from 1454 to 1492 (note: the actual limitation is at 1486 regardless of whether you exceed this number or not).
4) Close RegEdit
5) Go to "Start" -> "Control Panel"
6) Click on "Network & Internet Connections"
7) Click on "Network Connections"
8) Right click on the "Local Area Connection" icon for your EnterNet listed as "Efficient Network Enternet" -> Choose "Properties"
9) In "General" tab click "Configure"
10) Click "Advanced" tab
11) Click "Max Frame Size" -> Change to MTU you desire
12) Click "LCPMRU" -> Change to match the MTU you changed in step 11
13) Click "OK"
14) Done!

I got this from a broadband site sometime ago.

>>You can try changing the MTU (Maximum Transmision Unit) for TCPIP to 1454.
>>
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>How does one do this? Is there a KB article or something describing the process? I assume it involves fiddling with registry entries on the workstation.