are you logged in as the admin?options f8 safe mode and chose last good config or this for this time being>
http://support.microsoft.com/default.aspx?kbid=192806&product=w98 and the sasser worm did you use system restore it still maybe there if you didnot disable itwhen running a virus scan,and try this to make sure the sasser has gone>
http://vil.nai.com/vil/stinger/