Cannot Mount Any ISO in Windows 8.1 Pro

I cannot mount any ISO images on my Windows 8.1 Pro machine. I have tried the "Mount" under right-click as well as Powershell with the same results. From the UI, I get a simple message "Sorry there was a problem mounting the file."
while from Powershell I get an HResult that from searching seems to be rather generic.
I have followed the idea about upper filter and lower filter. I have made sure that the ISO is not "sparse". I made sure that ISO's are associated with Windows Explorer. I have tried a number of ISO's all from either TechNet or MSDN
with the same results. ProcMon doesn't really offer anything useful as the number of entries is overwhelming to try to limit to just mounting an image.
I read several posts where drive letters were an issue, but no guidance was given regarding what drive letter the virtual drive preferred.
I can mount the same ISO files on another Windows 8.1 Pro machine, so it isn't the ISO itself.
Any ideas? I have spent the entire day working on this problem and I really need some help.
Thanks,
Glen

I was struggling with this too. I found that the problem is a 'sparse' attribute that gets added by the Akamai downloader (known bug). To fix just copy the ISO (and the VHD) files to another folder this removes the (P). I found the answer at:
http://serverfault.com/questions/424794/fail-to-mount-image-files-in-windows-server-2012
Rusty
Rusty Brown
I have used mounting ISO images, sparce files and so on. No issues.
this suggests its time for a fresh install of windows, backup twice in case of the unthinkable
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