Hey, has anyone used this? im having some stability problems when playing games and i think i come to a conclusion its my memory. So to test it i use this Win 7's own diagnostic tool, it passes the standard test no problem. But when i choose extended test, it seems to stop on 21% and looks like its doing nothing. While its stuck on 21% its shows the message "no problems have been detected" and "although the test may appear inactive its still running etc". I can also exit it when i want, i can choose another test. so its not crashing. i just wan to know what it is doing. How long should a extended memory pass take using this?