aşağıdaki gibi bir açıklama var bir sitede

oncelikle,
command prompt acip
nslookup www.youtube.com
nslookup img.xxx.com
nslookup www.google.com
yazin. bu uc komutun sonuclarini goruma da yazin, duzgun IP geri donmeyen query icin
nslookup <domain> 8.8.8.8
yazin. sizin TCP/IP ayrlarindaki dnslerden oldugunu dusunuyorum (gir2.exe gibi yazilimlari silin kaldirin uninstall edin, kill edin, yok edin)

sonrasinda
ping www.youtube.com
ping img.xxx.com
sonuclarini da yollayin

C:\Windows\System32\drivers\etc altindaki hosts dosyanizda
sadece
127.0.0.1 localhost

satiri olsun. sorunu cozdukten sonra youtube'e girmek icin dns server olarak 8.8.8.8 yazip alttaki satirlari eklersiniz.
yukaridaki komutlarin ciktilari fikir verecektir sorunun nereden olduguna dair.
74.125.43.103 youtube.com
74.125.43.103 www.youtube.com
209.85.227.106 code.google.com
209.85.227.106 pages.google.com
209.85.227.106 video.google.com
209.85.227.106 translate.google.com.tr
209.85.227.106 docs.google.com
209.85.227.106 sites.google.com
209.85.227.106 books.google.com
209.85.227.106 chrome.google.com
209.85.227.106 sketchup.google.com
209.85.227.106 froogle.google.com
209.85.227.106 labs.google.com
209.85.227.106 mars.google.com
209.85.227.106 moon.google.com
209.85.227.106 notebook.google.com
209.85.227.106 toolbar.google.com
209.85.227.106 browsersync.google.com
209.85.227.106 catalog.google.com
209.85.227.106 codesearch.google.com
209.85.227.106 dir.google.com
209.85.227.106 earth.google.com
209.85.227.106 groups.google.com.tr
209.85.227.106 shopping.google.com
209.85.227.106 sky.google.com
209.85.227.106 support.google.com
209.85.227.106 tools.google.com
209.85.227.106 wap.google.com
209.85.227.106 answers.google.com
209.85.227.106 google-analystics.com
209.85.227.106 translate.google.com
209.85.227.106 mt1.google.com
209.85.227.106 dl.google.com