Anyway, I've solved my problem other way. Uninstall device, uninstall software, remove all oem*.inf and oem*.pnf for Linksys products (searched by keyword "Linksys"). Also one of Microsoft drivers was provided for this so I've decided to change its name. After reboot and normal installation procedure everything works ok.
Using www.linksys.com/easy and use Netcheck. Easy because this great tool will automatically set-up and install the device for you. Hard because you have the haul the computer to where the actual router is and connect it via ethernet cord so that you could get online to access the webpage.
You don't know what you are talking about. I have done all you suggested 3 times and still get the same result. You'd think "Plug and Play" is some new term for linksys. Apparently, this term escapes you as well.