If you do not want to see Yahoo advertisement in your PC
Just follow the steps mentioned below:
There is a file named “host” under
Windows XP: C:\WINDOWS\system32\drivers\etc
Windows 2000: C:\WINNT\system32\drivers\etc
Windows 98 or ME: C:\WINDOWS\
Append the following lines to host file
127.0.0.1 bluelithium.com
127.0.0.1 ads.bluelithium.com
127.0.0.1 yieldmanager.com
127.0.0.1 ad.yieldmanager.com
127.0.0.1 overture.com
127.0.0.1 srv.overture.com
127.0.0.1 rds.yahoo.com
127.0.0.1 searchmarketing.yahoo.com
This will make sure you do not click your own advertisement as well.
hope this info helps you all