why isn't twitter working in my system!!!?

[Vennam]

for the past 2 weeks twitter is not working on my system.
When i try logging into the website it says "Website is unavailable. The server at twitter.com can't be found, because the DNS lookup failed." When i try logging from other systems it is getting opened, but not in mine
2 weeks before i have configured my router with my LAN settings, which is no where concerned to twitter. After that only i've noticed that twitter wasn't opening. All the other websites open and no problems with those except with twitter.
I need solution for this problem pls.

[Daniel]

Twitter is Probably Blocked in your Network Thats Probably why you Have Some Kind of Filter Installed on your Computer Check and See if you have Any Blocking Software installed If you need More Help Contact your Internet Service Provider