Tech Support

When I turn on my computer, a screen pops up reading "Application is not a valid image. Please check against installation diskette." I'm unable to make the panel disappear, despite agreeing with it, "O.K." or by pressing Exit. Frustrated, I found by pressing Exit about 20+ times, the screen would disappear so I could use the computer, FOR A WHILE, until it reared its ugly head again. I emailed my personal tech support person, whose return email advised "Try using chrome." WTF!