my brother didn't something means he was playing with playing with registry and systems,he was tweaking system for fast performance,now it result to great pain,my wifi have stop working,when i switch wifi its on,and shows indication of on with light but it doesn't shows any wifi connection its says "no wireless networks were found in range. make sure the wireless switch on your computer is on......"i have reinstall wifi driver but still problem is same,i think it must have been disable from system or registry or so on,so can any one help me???