I have a PC in a classroom attached to a projector. Sometimes a teacher will want to show a youtube video or other flash content to their class. The PC has not really been used all summer.
Now as the semester starts I get a report that flash is not installed on the machine. I go to check it out, and not only is flash not installed in IE8, but it will not install. When you try to install it, IE has to close the tab after two attempts.
I have tried removing and re-installing Internet Explorer, resetting all the security and privacy options to defaults, and I've also done a system restore going back a couple weeks with no luck. Flash works fine in firefox on the machine, but that's really a kludge - not all the teachers will want to do that.
Any ideas for how to fix this?