In the summer of 2016 I spent some days being really troubled around the problem on getting Gem working on a windows machine.
The solution came with the dll file msvcr71.dll. 
There was also a thread called "missing MSVCR71.DLL on Win10, Gem can't load library" this spring.
You might check it out. 
Best / Björn Eriksson

P.S. Some copy/paste from that other thread down below here.

Ok, I see. It works without re-install or re-start. Just copy the file (msvcr71.dll) to that location (C:\Windows\System OR SysWOW64 OR installed Gem Folder)

Thanks,
Jonghyun

On Tue, Apr 11, 2017 at 4:13 PM, IOhannes m zmoelnig <zmoelnig@iem.at> wrote:
On 2017-04-10 23:38, Jonghyun Kim wrote:
> 3) Reinstall Gem and restart Pd

i seriously doubt that you need to re-install anything after putting
msvcr71.dll into the PATH.
you *might* not even need to restart Pd (but then, this is a simple enough).

fgamsdr
IOhannes

On Wed, Oct 11, 2017 at 4:39 PM, Peter P. <peterparker@fastmail.com> wrote:
Hi list,

* Peter P. <peterparker@fastmail.com> [2017-10-07 21:33]:
> Hi list,
>
> running Pd 0.48-0 vanilla on Windows and installing Gem 0.93.3 via Deken
> causes Problems at a few computers around me.
>
> Gem loads with a [declare -lib Gem] object, but creating a [gemwin]
> object by sending it the [create< message fails with many lines of
>       ... couldn't create
>        GLdefine GL_LINEAR
>       ... couldn't create
>        GLdefine GL_EXP
>       ... couldn't create
>        GLdefine GL_EXP2
>       ... couldn't create
>        GLdefine GL_COLOR_BUFFER_BIT
>       ... couldn't create
>        GLdefine GL_DEPTH_BUFFER_BIT
>       ... couldn't create
>        GLdefine GL_STENCIL_BUFFER_BIT
>       ... couldn't create
>        GEMglMatrixMode GL_MODELVIEW
>       ... couldn't create
>        GEMgluLookAt 0 0 4 0 0 0 0 1 0
>       ... couldn't create
>        GEMglLoadIdentity
>       ... couldn't create
>        GEMglMatrixMode GL_PROJECTION
>       ... couldn't create
>        GEMglLoadIdentity
>       ... couldn't create
>        GEMglFrustum -1 1 -1 1 1 20
>       ... couldn't create
>
> IOhannes suspected a problem with the presence of a file Gem-meta.pd in
> the search path, but there seems no such file present on the computers
> at hand.
>
> Using the Gem Windows installer from
> http://gem.iem.at/releases/0.93.3/Gem-0.93.3-W32-i686.exe
> did not help either.
>
> This problem persists largely on Windows 10 machines and is present or
> not on identical operating system versions on different installations.

After a suggestion that Gem might be lacking certain Microsoft Visual
C++ libraries in Windows10 installations I am trying to track down the
exact name of the required libraries. I am unable to find that
information from the mailinglist archive. It would be great if someone
who has/had the same problem could help us out here.

Thank you for all ideas,
Peter

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