Network slowness issues - T500 - Windows7

[chsco]

I am currently upgrading my T500 laptops (2082-94U) to Windows7 and am having what I believe to be NIC driver issues.  I loaded a fresh install of Win7 Enterprise x64 (tried standard and sp1) and now the data transfer rate when moving files on the network are extremely slow.  They never get above 72k/s.  This is happening on every 94U model that I try.  I have an older T500 and also T510s which do not see the issue.  I have tried the drivers (most recent and older versions) on both the Intel site as well as the Lenovo site with no luck. The transfer speed is fine if I load XP on the same systems.

Has anyone seen this and if so have you found a way to resolve?  Thanks in advance for any help...

[ColonelONeill]

Do you have Remote Differential Compression enabled?

[chsco]

RDC is turned on for all the models that I have installed Win7 on, problem machine type or not.

[MrPeter1985 Guru]

Have you tried or made your Win7 machines leave the HOMEGROUP? My laptop works better with all networks after leaving it.

[chsco]

These are not on a HOMEGRPOUP but on a corporate domain.  Odd thing is I have 4 models of Laptops and only one specific type of the T500 has the issue.  Has to be a NIC version on that one specific model.