go to your network connection
click on it.
Highlight Internet Protocol (TCP/IP)
Click properties.
The IP and DNS should be automatic? if youve got numbers in there, that maybe your problem.
I may be talking out my ass but that what happened to me, i found the file in a hijack this log, it was actually called DNS something with an address after it which was handy. it can be disguised as a legit file though.