In Win2k8 NLBS is a feature. There are 2 ways to install NLBS:
1. Click Start, point to Administrative Tools, and then click Server Manager. In the Features Summary area of the Server Manager main window, click Add Features.
-- or --
In the Customize this server area of the Initial Configuration Tasks window, click Add Features.
2. In the Add Features Wizard, select the checkbox next to Windows Network Load Balancing.
3. Click Install.
OR simply run the following from a cmd prompt Servermanagercmd.exe - install nlb