I have a linksys wireless-g. i have a linksys wireless-g broadband router model#wrt54g.this unit

Question

i have a linksys wireless-g broadband router model#wrt54g.this unit was working fine, until today when suddenly it was as if the computer( desktop model DEll dimension 8400 running widows vista ultimate) no longer recognized that the router was part of the loop between modem and computer. i have tried unplugging everytning and reinstalling...but i do not have driver discs. this was not a problem in the beginning as windows found and set up lan on it's own. please help