Hi @Revie ,
it looks like your environment variables are not correctly configured for Node and Npm.
Try to reinstall it using the windows installer, and check the option to add Node to the environment variables.
And then close all terminals and reopen, so it loads the new environment variable.
Alternatively, if you feel comfortable, you can edit the environment variables manually and add the path for your node installation.
https://nodejs.org/en/download/
Cheers