ASDL through Rj45 to USB converter - Quick & easy one!!!

I realise that there are USB modems out there, but if I use a converter on the end of a RJ45 ethernet cable to connect broadband through a USB port would it work? Here's a converter I found cheap online:


http://bestofferbuy.com/USB-over-RJ...ource=gbase&utm_medium=cse&utm_campaign=gbase




My computer turns itself off anytime my internet cable is plugged in (see thread http://forums.majorgeeks.com/showthread.php?t=214203) so i've decided to try and bypass the situation.