Why i cant browse on youtube like streaming sites!!!?

I believe it's on the download page

i started this thread but i found the problem cause.i m using windows 7 x64 and i have always been a mcafee user,i trust it but i didnt have its windows7 compatible version,all those MTP on net is not compatible with windows7,i have tested.
i had installed bitdefender 2010 AV,n somehow i felt that it is making problem,and when i uninstalled it,everything went smooth as before.now i am normal.no problem.