DNS Error

Hey every one
I am using window xp(sp-2)with IE6 on my machine,my IE6 is working fine and site's are accessable but for last 3 days i am unable to access my own site,www.anandigital.com
(i.p.220.225.3.7) putting in address bar is showing a page "page can not be displayed" with a message at bottom server not found or DNS error,ping to i.p. is replying ok but ping to my server72.52.252.150 is replying request timed out.My hosting provider advised to use open dns,i am using,but problem is still there.i hope that YOU can solve this.