Upon trying to remove the node_modules directory created by npm install:
The source file name(s) are larger than is su
Sometimes, even if you install rimraf globally you can have a local rimraf dependency (SASS usually have it). In this case I would run following commands:
Follow first 2 steps as usagidon recommended, if you have issues or errors try
npm uninstall rimraf & rimraf node_modules
this will delete local rimraf and use the global one