For a sluggish computer, a program that won't open, a full-on crash, or weird visuals. These usually have more than one possible cause, so this won't hand you a fake one-word verdict — it narrows things to the leading suspects and shows the check that tells them apart. (And no — it's usually not the graphics driver, even though that gets blamed first.)
For a sluggish computer, a program that won't open, a full-on crash, or weird visuals — this narrows things to the leading suspects and shows the check that tells them apart.