cannot open internet-options after insta

i have setup win2k with network-card 1 for cablemodem. systemadministrator is activated(PLUS GUEST , PLUS OWNER). after exchanging networkcard(i wanted to use on other pc) i cannot enter internetoptions. systemadministrator is needed. i do not knowhow to unlock this. i have set a path. but its so complicated, not easy to understand, even using instruction book win2k prof. thanks. its urgent