Since yesterday my computer has been randomly freezing. I've got a lenovo thinkpad and I'm using windows 7 professional. It doesn't seem to be tied to any program I've been using, because it happens even when I'm not running anything. At first if I have something open the program will freeze and it'll say that it's unresponsive, but then the entire screen freezes up and I can't do anything. Pressing ctrl+alt+del doesn't even do anything, so the only way to shut down my computer is to do it manually. I recently just got my computer working again when there was a problem with the taskbar (the topic is still on the first page here). But this problem only started yesterday. I've run ccleaner several times, and malwarebytes also, but it hasn't found anything. I'm not sure what to do at this point.