Internet browsing problem

Well I dont know how to explain it but i would do my best. Two specific webpages give me the following problem: if i use http://www.athlonoc.com i get a page thats dated september 12. if i put http://athlonoc.com i get the correct page. if i put www.voodooextreme.com i get page cannot be displayed but if i use http://voodooextreme.com it works fine. Now both IE 5.0,5.1,5.5 and netscape have the same problem. This specific computer its an athlon with win98. I cannot figure it out!!!
Clearedhistory, deleted cookies i did everything that i could think off and same problem. Anyone can help me?

ps. i did not notice any problems with any other websites