I tried to download Tetris yesterday onto my laptop - not quite what you would call an ambitious gamer!
As it was doing so I noticed that the software was trying to alter some settings in the registry.
Now whenever I am in Mozilla I get a pop up saying my PC has 7 window errors and can run faster. I cannot see how to get rid of this.
When I copy the link location it says:
and here is the image
Such a pop-up is likely caused by malware installed on your computer.
Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
You can also do a check for a rootkit infection with TDSSKiller.