The following occurred on an HP laptop running Windows 7 Professional, and I find it quite peculiar and can't figure out what's going on nor how to fix it.
The machine had Adobe Reader XI installed on it and an attempt was made to update it to Adobe Reader DC. I've done this on multiple machines as an "install over" with zero issues. Things were going along swimmingly and even the desktop icon had been switched then when the install was nearly finished it failed.
After this there was no record of Adobe Reader in Control Panel->Programs and Features at all (as I was intending to force an uninstall at this point).
When I attempted to install Adobe Reader DC again it failed quickly saying that a more recent version was installed, which leaves me with nothing from Adobe for reading PDFs. This would not be a huge problem under normal circumstances, but the laptop is used by someone who's blind, in conjunction with the JAWS software, and it only plays well and reliably with Adobe Reader.
I even tried rolling the machine back to a Restore Point from several days ago. That didn't help either. It looked like Adobe Reader XI had been restored but now when one attempts to open a PDF document an "Unknown Software" message is presented.
Any guidance on this issue would be appreciated.