When you say VIdeoDownloader my spider senses cringe. Most VideoDownloaders are or are infected with Virus's. It feels like an infection to me. I doubt its an acutal memory leak. Also most virus's will mess with your network settings, making it very slow to surf or do anything network related. What OS you running? If Windows 7, Uninstall any anti virus programs and download and run the following; 1. http://www.bleepingcomputer.com/download/rkill/ 2. http://www.bleepingcomputer.com/download/tdsskiller/ 3. http://www.bleepingcomputer.com/download/junkware-removal-tool/ 4. http://www.bleepingcomputer.com/download/adwcleaner/ 5. http://www.bleepingcomputer.com/download/hitmanpro/ 6. http://www.bleepingcomputer.com/download/combofix/ 7. https://www.malwarebytes.org/mwb-download/ Uninstall Malwarebytes 8. https://www.safer-networking.org/mirrors/ Uninstall SpyBot S&D 9. https://www.avast.com/en-ca/download-thank-you.php?product=FAV-ONLINE&locale=en-ca Uninstall Avast 10. http://windows.microsoft.com/en-CA/windows/security-essentials-download Either keep MSE as antivirus or uninstall and reinstall you choice of anti-virus software If Windows 8 or 10 skip combofix as it will not work. This is my standard method of cleaning a computer of Virus's. If something will not unistall, like AntiVirus Pro 2015 (a virus) use Revo Unistaller in Hunter mode to remove that program. http://www.revouninstaller.com/download-free-portable.php This should help clean the PC and hopefully fix your issue. I do not guarantee that this will not break windows if it is a bad infection. ALWAYS backup important things before running any of this list. This may not fix any things a virus broke (IE Changing all your exe files to open in Picasa to become exe files again, but should get rid of the virus's themselves. Hope that helps. Cai, aka computer wiz