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still struggling with firefox. I uninstalled and reinstalled. ... tried to. The downloaded install stub (for ver 43.0.3) just doesn't run. Yes it downloads OK, I stick it on the desktop but double clicking or doing the 'run as administrator' just doesn't do anything. Not starting any process.

But I still have an installer for an old version (v 3.5.5) hanging around and that does run. And once installed it works. ... and I can upgrade ... and then it stops working.

I suspect there is some issue preventing the latest Firefox stuff from running on Windows Vista.