On this page
http://www.microsoft.com/windows/pr...
MSoft say:
"The most important first step is to choose a wireless router that is Certified for Windows Vista. Look for the Certified for Windows Vista logo to ensure a wireless router is Certified for Windows Vista. These routers offer the most reliable performance for streaming your entertainment and also enable easier setup and maintenance. When you see this logo, you can be assured that the wireless router has been specifically tested to work with Windows Media Center Extenders. The presence of the logo also eliminates the challenge of trying to interpret sometimes confusing claims and specifications from routers that are not certified. All wireless routers that are Certified for Windows Vista support dual-band wireless networking. This means that the router operates at two different frequenciesthe standard 2.4-GHz frequency and, all-important for video and TV, the 5-GHz frequency...... etc etc"