I have no certificate and never did! My newer laptop w/7 is fine on the same wireless network!
I read a million storys all saying to uncheck the 802 ieeeee blah blah, Well i did and it was not checked!!!
so i checked it, still no go, I tried restoring the computer and still no go, some bizzare certificate that everybody has issues with yet no answers to online! it says allow to share a connection and allow another to control etc, WTH I spent 5 hours getting nowhere reading 500 posts that all say nothing helpful!