IE cannot resolve DNS names

I have a Vista Home Premium desktop and a about 2 weeks ago Internet
Explorer decided it will no longer resolve DNS names. I can run other
internet applications, ping URLs, and browse the web using Firefox so
I know the computer is reaching the internet, but IE will not display
pages.

I have reset Winsock, uninstalled several updates, flushed the DNS
cache, reset IE settings to defaults, etc. nothing has worked so far.
Any suggestions on what might be causing this?

Justin G Mitchell