If you are able to ping an address by name (i.e. yahoo.com, google.com, cnn.com, etc) then your DNS servers are working fine.
Another way to test your DNS servers:
Open a web browser window, type in 204.214.208.2 (www.dbtech.net), the page will load if your DNS are resolving addresses.
If the page doesn't load, then your DNS are not working.
The most common problem after a virus attacks your computer and these are the symptoms, more than likely your winsock.dll and wsock32.dll have been damaged, renamed, or deleted.
Or, maybe you have multiple and the connection gets confused.
Are you a dialup customer or are you cable, DSL?
To fix those files, do a find file for winsock.dll and wsock32.dll, they should be inside your C:\windows\system folder.
Rename them, if you cannot, this means your computer is using them.
Boot into safe mode and rename them there.
Reboot into normal mode and get your Win98SE CD ready.
Click on Start
Go to Programs
Go to Accessories
Go to System Tools
Click on System Information
When the window opens, click on Tools at the top, choose System File checker.
Let it scan your hard drive for any changes made to your system files and it when it finds those files that have been modified, corruptedor deleted it will ask you if you want to restore from original CD, you choose yes, and follow directions.
Reboot and try again.
I hope this helps!