I have a Dell XPS M1530 with a fresh install of Windows 7 Ultimate 64bit. I lost my wireless capability all of a sudden with the previous install of Home Premium. Yes, the wireless switch is turned on. The machine has Intel Wireless WiFi Link 4965AGN Network Adapter and Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller. I have it hard-wired to my router with an Ethernet Cable. It's working fine.
Are there any suggestions as to how I can get my wireless capability back?