Try a hard reset of your router. There should be a small reset button portal on the back of the router. Hold the reset button in for a few seconds. Then let the router reboot.
Then, unplug the dsl/modem and the reset router. Wait a few minutes then plug back in the dsl/cable modem followed by the router.
Windows should find the Netgear Router as it previously did.
Be sure that when you set WPA or WEP that you follow the instructions to the letter. I hope that helps.
I have an ACER Travelmate 240 Laptop with Sprint DSL service. When I set up a Netgear WGR614v6 Wireless Router everything was great. Everything worked well until I turned the laptop off. The next morning I had no access to the wireless network. I have gone through the setup again and done everything I know. Anyone got any secrets they want to share? Personally I am not very impressed with Netgear equipment. Thanks - Harold