Hi Pete,
I'd like to review the Flash Player install log file(s). On a 32-bit OS, it's located in \Windows\System32\Macromed\Flash. On 64-bit OS, in addition to the System32 location, there's another file in the \Windows\SysWow64\Macromed\Flash directory. Please share the file(s) using the instructions here, How to share a document.
Thank you.
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Maria