Do you have a firewall? If yes, when you start the pinging, tell
the firewall to allow it.
Here's how it would look like if it's successful:
You will see 4 replies from 216.109.112.135 (that is Yahoo! IP
address).
If you get a very complete different set, create the following file
and run it.
Open Notepad. Use notepad and no other editors or else it doesn't
work. Copy and paste the code below:
tracert yahoo.com > results.txt
notepad results.txt
Save this file.
For the File name, type in: trace.bat
For the Save as type: All Files
Click Save. results.txt should appear once the tracing is done. If
it asks you to create a file, click Yes. If the firewall prompts
you, allow it.