One minute, everything seems fine, and the next, your computer is back to speeds you haven't seen since 1995 dial-up.Or maybe you're browsing the interwebs and find yourself drowning in pop-ups, even though you totally have ad-blocker installed.Or, you've been hearing your laptop make suspicious noises, even when it's closed and not in use as if the ghost of a long-dead IT tech is trying to work through some new paranormal code.If you are noticing something weird with your computer, it may not be time…