I recently had to install Server 2008 R2 on an old Dell Poweredge 2850 and had a need to team the network adaptors. Intel sadly dont support this as standard so you have to follow a couple of steps to get it working!
First you need to download the driver CD Zip file from here:http://www.lostmydrivers.com/driver/download/25242/Intel/Network-Drivers/INTEL-PRO-1000-MT-DRIVER-15.3-WINDOWS-XP-32-64-2003-32-64-VISTA-32-64-7-32-64-WINDOWS-VISTA-WIN20.
Extract the content and update the drivers from the \V15.3_CD\PRO1000\Winx64\NDIS61 folder in device manager.
Once the drivers have been updated you can install the teaming software from \V15.3_CD\APPS\PROSETDX\Winx64\ProsetDX.msi and it should run through and add the necessary tabs to the network adaptors in device manager.