I've been having this problem for a while now, certain sites simply refuse to load or load very very slowly, these being wikipedia and hell.game-host.org (

), and i'm pretty sure it isn't my ISP. I'm running windows xp sp2 professional, i also have trouble opening flash based stuff online, some don't load at all, while some load very very slowly.
I checked msconfig, turned off all non microsoft processes, updating java, no firewall on, no anti-virus software active, and it still won't connect to said sites properly (it does connect actually, but very very very slow, and since i have this problem with hell.game-host.org too, mushclient locks up when connected to hellmoo at certain points).
Any ideas on what could be causing this, i've got this problem for a week now.