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A browser hijack script had taken the url of my homepage (my own site) in each browser and attached a url of its own (<snip> banner) to pop up in a window whenever I opened my site in Mozilla or Netscape. Also, intentionally or otherwise, it prevented AdSense ads from displaying.
Mcafee Virus Scan hadn't found anything and neither AdAware 6 or Spybot S&D picked up and problems either.
The solution was a program called - HijackThis.
Check the contents of this file:
c:\WINDOWS\system32\drivers\etc\hosts (no extension)
If there's more than one line (localhost), chances are that will be your problem.
If you're having this problem, run the HijackThis program and look for suspicious entries labelled R0, N3, 01. I 'fixed' all of these entries, rebooted and now the problems have gone and AdSense is showing again! >:o))
[edited by: Jenstar at 1:59 pm (utc) on Nov. 8, 2003]
[edit reason] No URLs please! [/edit]
Speaking of which, Spybot allows you to lock the hosts file so that nothing can modify it. Same goes for your internet settings in ie.
Here are the likely places you'll find your hosts file:
Many of the parasite-ware programs that modify the hsots files also block affiliate links through all of the major networks. It's been a growing problem.