I just installed Windows 7 Ultimate - 64 the other day with no problems. I did a fresh install. My old wireless G adapter isn't compatible with Windows Vista or WIndows 7 so last night I got a Linksys WRT400N wireless router and a WUSB600N adapter for my desktop. I set the router up and got all of my other computers in the house connected to it with no problems. I downloaded the Windows 7 drivers for the WUSB600N and saved them on a flash drive. I went ahead and installed the WUSB600N with the drivers and it showed up in Device Manager with no problems. When I open the Network and Sharing Center, no wireless networks are shown. When I click on Change Adapter Settings, only my ethernet port comes up, not the wireless adapter. Neither Linksys or Windows support were of any help. I have seen online that other people have this particular adapter working in Windows 7 but I can't get it to work for the life of me. If anyone can help me out I'd greatly appreciate it. Thanks.