You can use ipconfig, just like you could on 2000 and XP. But you will need to run it in an elevated Command Prompt window if you have User Access Control turned on. type "command" without the quotes in the Start menu search box, and when Command Prompt appears, right-click and go to "Run as Administrator." Then, type "ipconfig /release", wait, and type "ipconfig /renew".
Computer: Intel Core i5-750 2.66 GHz quad-core processor @ 3.71 GHz | Asus P7P55D-E motherboard | Crucial 4 GB DDR3-1333 RAM | nVidia GeForce 8600GT | 2x WD Caviar Black WD1501FASS 1.5TB hard drives in RAID 1 | Antec Sonata III case with Antec EarthWatts 500-watt PSU | Dual Dell UltraSharp 2408WFP 24" widescreens | Windows 7 Ultimate 64-bit
Other: 2005 Subaru Legacy 2.5GT sedan 5MT | Samsung Epic 4G Smartphone | Mamiya M645 1000S medium-format SLR with 55mm f/2.8, 70mm f/2.8, 210mm f/4, teleconverter, 120 and 220 film backs | Olympus E-PL1 Micro-4/3s DSLR with 14-42mm and 40-150mm lenses