sorry Im really clueless about what your issue is all about. these are clearly not screenshots from your PC, do you mean that you dont see the connection icon in the taskbar ?
correct me if im wrong :
1- you installed windows 7
2- you bought wifi adapter and it was working fine but recently it stopped working
3- if you plug the adapter the internet will disconnect even if the ethernet cable is plugged in
4- if you remove the adapter the internet will work fine