i am unable to open y-a-h-oo relaed sites on my browsers..

i have problem with yahoo sites only...other sites are working fine when i try to open their site it says "yaho-o has been bann ed"

Are you using a company computer? It's possible their blocking pages from yahoo to discourage people from using their computers other that for work. Try checking your browser's security settings and check if yahoo is blocked. If you're using a pc at home, try checking with your isp if they're blocking yahoo. Hope this helps.