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You know, I had not thought of using an older version of IE before you asked that. So I uninstalled IE9 again, which made Windows revert to the version I had when the computer was brand new. Therefore now I am running IE7 and it is not crashing.
I will try and upgrade to IE8. If it does not work, I will revert to IE7, which is at least safe, or seems to be.
I will take the deeper analysis as a plan B. On second thought, I am probably going to follow it after the IE experiment, though it may take a while.
Again – thanks a lot for the ideas. I am bringing feedback after the tinkering.