I recently downloaded a matrix code screensaver here and since then my entire computer has been running slow and it takes forever to open chrome and other icons. Also I get random advertisement popups now(on websites like facebook, google, techspot). I scanned for a virus but came up short :/ and I don't know if it installed any other programs. Any suggestions for a scan or anything? Edit: It also installed avg and the avg secure search opens on new tab, I uninstalled it and relaunched chrome and the secure search went away but after another relaunch it persists.