Forum Moderators: martinibuster
If they're absent only from your own sites then I'd empty the browser cache, then close and re-open the browser.
If they've vanished from all sites then you might want to take a look at your hosts file to see if a redirect has been put on Google's ads - presumably it would be an unsuccessful redirect if you're not seeing anything else in their place but I'd check it anyway. Open your hosts file in Notepad, and if you see a line which contains a reference to pagead2.googlesyndication.com like this:
###.###.###.### pagead2.googlesyndication.com
... then just delete that line, then save the file and close it. Then close any browsers which are open, and then re-open them and see if it's had any effect.