uninstall node.js
delete all node_modules from your directory
delete npm from AppData>Roaming>
delete npm_cache and all newly generated node files from the c:\users[username} directory.
install node.js
add local path as:
new>PATH>c:\users[username}\AppData\Roaming\npm
keep this before Temp path
in cmd:
npm -v
node -v
C:\Users\693272>npm install -g @angular/cli
ng -v
(here 'ng' error should not come)
and now you can go to some other directory also and create your new project as
everything installed is set globally
C:\Users\693272>cd /
C:>d:
D:>ng new app1 -d
HOPE THIS HELPS!