Solved Can't acces to facebook and youtube

Hey guys i cant connect to facebook.com and youtube.com from my computer anymore 2 weeks ago.

I can access to youtube and facebook using my ipod or using a proxy if i want to access from my computer.
im sure that my computer has no virues nor malwares.

I dont know wats the problem please help me.
Thanks a lot.

what do you get when you ping facebook.com

pinging facebook.com [78.16.49.15] with 32 bytes of date:
request timed out.
request timed out.
request timed out.
request timed out.

ping statistics for 78.16.49.15:
packets: sent = 4, Receoved = 0, Lost = 4 (100% loss)

i found the solution after i checked 0pTical 's post. http://www.sevenforums.com/network-...on-issue-cannot-connect-youtube-facebook.html
i googled it and changed my dns server and it works now.
thanks for ur time