TopoJson Install Error? - node.js

Question

I am trying to install topojson with node.js and I am getting a frustrating error. I reinstalled the latest version of node.js (4.4.5) and running the standard install method. It seems like everything installs correctly. Then I try to do something with topojson and it is clear that not everything is installed correctly--illegal operation on directory. So it seems like it is installed but that I am having permission problems perhaps? Can anyone help with this?
C:\>npm install -g topojson
C:\Users\Seth\AppData\Roaming\npm\topojson-geojson -> C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson-geojson
C:\Users\Seth\AppData\Roaming\npm\topojson -> C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson
C:\Users\Seth\AppData\Roaming\npm\topojson-merge -> C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson-merge
C:\Users\Seth\AppData\Roaming\npm\topojson-group -> C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson-group
C:\Users\Seth\AppData\Roaming\npm\topojson-svg -> C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson-svg
C:\Users\Seth\AppData\Roaming\npm
└─┬ topojson#1.6.26
├── d3#3.5.17
├─┬ d3-geo-projection#0.2.16
│ └─┬ brfs#1.4.3
│ ├─┬ quote-stream#1.0.2
│ │ ├── buffer-equal#0.0.1
│ │ └── minimist#1.2.0
│ ├── resolve#1.1.7
│ ├─┬ static-module#1.3.1
│ │ ├─┬ concat-stream#1.4.10
│ │ │ ├── inherits#2.0.1
│ │ │ ├─┬ readable-stream#1.1.14
│ │ │ │ └── isarray#0.0.1
│ │ │ └── typedarray#0.0.6
│ │ ├─┬ duplexer2#0.0.2
│ │ │ └─┬ readable-stream#1.1.14
│ │ │ └── isarray#0.0.1
│ │ ├─┬ escodegen#1.3.3
│ │ │ ├── esprima#1.1.1
│ │ │ ├── estraverse#1.5.1
│ │ │ ├── esutils#1.0.0
│ │ │ └─┬ source-map#0.1.43
│ │ │ └── amdefine#1.0.0
│ │ ├─┬ falafel#1.2.0
│ │ │ ├── acorn#1.2.2
│ │ │ ├── foreach#2.0.5
│ │ │ ├── isarray#0.0.1
│ │ │ └── object-keys#1.0.9
│ │ ├─┬ has#1.0.1
│ │ │ └── function-bind#1.1.0
│ │ ├── object-inspect#0.4.0
│ │ ├─┬ quote-stream#0.0.0
│ │ │ └── minimist#0.0.8
│ │ ├─┬ readable-stream#1.0.34
│ │ │ ├── core-util-is#1.0.2
│ │ │ ├── isarray#0.0.1
│ │ │ └── string_decoder#0.10.31
│ │ ├── shallow-copy#0.0.1
│ │ ├─┬ static-eval#0.2.4
│ │ │ └─┬ escodegen#0.0.28
│ │ │ ├── esprima#1.0.4
│ │ │ └── estraverse#1.3.2
│ │ └─┬ through2#0.4.2
│ │ └─┬ xtend#2.1.2
│ │ └── object-keys#0.4.0
│ └─┬ through2#2.0.1
│ ├─┬ readable-stream#2.0.6
│ │ ├── isarray#1.0.0
│ │ ├── process-nextick-args#1.0.7
│ │ └── util-deprecate#1.0.2
│ └── xtend#4.0.1
├── d3-queue#2.0.3
├─┬ optimist#0.3.7
│ └── wordwrap#0.0.3
├── rw#1.3.2
└─┬ shapefile#0.3.1
├── d3-queue#1.2.3
└── iconv-lite#0.2.11
C:\>topojson -v
C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson:259
if (error) throw error;
^
Error: EISDIR: illegal operation on a directory, read
at Error (native)
at Object.fs.readSync (fs.js:603:19)
at module.exports (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\node_modules\rw\lib\rw\read-file-sync.js:14:28)
at Object.readFileSync (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\node_modules\rw\lib\rw\dash.js:7:19)
at inputJson (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson:245:30)
at start (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\node_modules\d3-queue\build\d3-queue.js:68:13)
at poke (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\node_modules\d3-queue\build\d3-queue.js:56:26)
at Queue.queue.defer (C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\node_modules\d3-queue\build\d3-queue.js:34:7)
at C:\Users\Seth\AppData\Roaming\npm\node_modules\topojson\bin\topojson:196:5
at Array.forEach (native)