i just reinstall my os (xp) on my laptop, but i can't use my wifi anymore. the wifi is built in, the os (also xp that's original install) gone mad so i reinstall a fresh copy of xp on my hp laptop. i use to just turn filp the swith on the front of my laptop and i can use wifi. but after i reinstall the new os nothing happen when i flip the switch. i don't see a wifi network on the bottom right corner. so what do i do. i guess it is probably have to do with a driver install but i don't know where to look. thanks.