Is this a page or part of a page (iframe) that is opened in a tab?

Do a malware check with some malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• AdwCleaner:
  http://www.bleepingcomputer.com/download/adwcleaner/
  http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender: Home Page:
  http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• Anti-rootkit utility TDSSKiller:
  http://support.kaspersky.com/5350?el=88446

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

its kind-a like pop-up error from windows. i already installed AdwCleaner and did the nessecary check-ups. The problem still remains.

After that i scanned my pc with AVG completely. Also did the rootkit-scan. No dagerous rootkits found.

i will scan my laptop with the rest of the malware products and get back here.

Could you take a screenshot of this error message if you come across it again?

Is that error appearing in an iframe (i.e. you see This Frame in the right-click context menu)?

Here, its like this. Im currently scanning with Malwarebytes Anti-Malware