Since 2 weeks, when I click on a link in my browser another window titled "about:blank" appears with some advertising.

I have run a Virus scan, but it didn't find anything suspect.

I guess it must be some kind of Java applet running in the background.

Do you know how to get rid of this applet?

TIA

If this is a WindowsOS PC then I'd suggest running the free-version of Malwarebyte. Another good piece of software for scanning for this is Ad-Aware from lavasoft.

Also check your Browser Proxy Configuration

Check to see if any toolbars or unwanted extensions have been added to your browser.

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11) Our contracts with our advertisers prohibit comments with regard to advertisements which appear on our forums. Such comments should not be posted and will be removed. Discussion of software or other methods to block advertisements is not allowed.

Ouch!!