1. I.E. doesn't shut down computers.
2. How are you posting on this site if using I.E. shuts down the computer.
3. I.E. or any other program when not working properly can freeze a computer or BSOD a computer but is does not shut a computer down.
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Maybe it's just the wording or terms we are using.
Which is what I'm trying to work through. That is why I'm asking silly little questions. To make sure we are on the same page.
I'm thinking a infection could cause such a goofy problem.
If we get down to thinking it is probably a infection we have people on this Forum that love to beat up on infections and will gladly help. If you have more that one computer you can use that might also help.
If by chance you are getting the Blue Screen of Death (BSOD) we have people that will help you through that kind of problem.