So here's an odd one for you all.
Machine: XPS1710, Win7 Ent, fully patched, gig network.

This was a clean build and not an upgrade.

When I move large amounts of data (GIG files) off this machine runs fine at 8-10 Megbytes/sec, but moving data onto machine runs VERY slow, 1-2 meg and the whole machine is like moving through jelly.
Huge CPU load and generally unusable.

I have replaced the standard windows NIC driver with the OEM's one, but still happens.

Not really to sure if this is a network issue, windoze or hardware.

Any ideas ?

On the network tab in task manager the network utilisation rarely goes above 5% and CPU usage is normally pegged at 75%+.

I am connected to a Gig switch and can transfer the same large files from my desktop machine with ease,