Video problem, it's appearing at the top corner of other windows

Question

Any time i watch a video say from youtube on the web, and then look at a differnet window, or even a different tab in firefox, the video starts to appear in the top left corner, with some tearing. It can't be clicked on, as whatever's clicked on will be what's in that corner of the program, but it blocks what i can see, even happens on the desktop.

Answer 1

Install Adblock Plus addon with Easylist subscription and check
* https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/
if still not go, Do a malware check with some malware scan programs. 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 the database before doing a scan.
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and Searches are redirected to another site