Error:eexist, mkdir ' C:\Users\gc57\AppData\Roaming\npm '--nodejs the cause of the error __JS

D:\PROGRAMME\NODEJS>NPM install-g express-generator@4 error:eexist, mkdir ' C:\Users\gc57\AppData\Roaming\npm ' d:\ Programme\nodejs>npm-v 1.4.23 d:\programme\nodejs>npm install-g express-generator@4 error:eexist, mkdir ' C:\Use RS\GC57\APPDATA\ROAMING\NPM ' d:\programme\nodejs>npm install-g Express error:eexist, mkdir ' C:\Users\gc57\AppData \ROAMING\NPM ' d:\programme\nodejs>npm install Express express@4.9.0 node_modules\express├──fresh@0.2.4├──merge-d escriptors@0.0.2├──range-parser@1.0.2├──utils-merge@1.0.0├──media-typer@0.3.0├──finalhandler@0.2.0├── serve-static@1.6.1├──cookie@0.1.2├──escape-html@1.0.1├──buffer-crc32@0.2.3├──cookie-signature@1.0.5├──vary@1.0 .0├──methods@1.1.0├──parseurl@1.3.0├──path-to-regexp@0.1.3├──depd@0.4.4├──qs@2.2.3├──on-finished@2.1.0 (Ee-fir st@1.0.5) ├──debug@2.0.0 (ms@0.6.2) ├──etag@1.3.1 (crc@3.0.0) ├──proxy-addr@1.0.1 (ipaddr.js@0.1.2) ├──type-is@1.5.1 ( mime-types@2.0.1) ├──accepts@1.1.0 (negotiator@0.4.7, mime-types@2.0.1) └──send@0.9.1 (ms@0.6.2, destroy@1.0.3, mime@1.2.11) d:\programme\nodejs>npm config

Get prefix C:\Users\gc57\AppData\Roaming\npm d:\programme\nodejs>npm config set prefix "D:\programme\nodejsexpress D:\PROGRAMME\NODEJS>NPM Install-g Express express@4.9.0 d:\programme\nodejsexpress\node_modules\express├── merge-descriptors@0.0.2├──cookie@0.1.2├──escape-html@1.0.1├──fresh@0.2.4├──range-parser@1.0.2├── cookie-signature@1.0.5├──finalhandler@0.2.0├──utils-merge@1.0.0├──vary@1.0.0├──media-typer@0.3.0├── parseurl@1.3.0├──methods@1.1.0├──serve-static@1.6.1├──buffer-crc32@0.2.3├──path-to-regexp@0.1.3├──depd@0.4.4├─ ─qs@2.2.3├──proxy-addr@1.0.1 (ipaddr.js@0.1.2) ├──on-finished@2.1.0 (ee-first@1.0.5) ├──debug@2.0.0 ms@0.6.2 (├──se) nd@0.9.1 (ms@0.6.2, destroy@1.0.3, mime@1.2.11) ├──etag@1.3.1 (crc@3.0.0) ├──accepts@1.1.0 (negotiator@0.4.7, mime-types@2.0.1) └──type-is@1.5.1 (mime-types@2.0.1) d:\programme\nodejs>