I had a similar problem when installing a version quite a while ago, on Win7, it was opening a requester, asking for permission to install on the C drive, but the requester was getting covered up immediately (for some reason) so I couldn't 'allow' it, and after a certain amount of time, the install then cancelled and rolled back.
In the end, I think I restarted machine, then waited for startup programs, then ran the installer before anything else was ran, making sure the install window was dragged to one side so it wouldn't cover up the requester, and was then able to O.K. it
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