New
#11
Do you have a HOST file with lots of entries or just the stock one? If you have more entries in your HOST file than the stock HOST file has, do any of them block google? For testing, you can rename the HOST file.
And when you pinged youtube, did you ping youtube.com or www.youtube.com?
You mentioned that your laptop (on the same network) can get to youtube - compare the ping response from your laptop to the computer that is not working. In other words, does pinging www.youtube.com get you a google server name?