昨天从官网上下载了4.2.1的安装包，安装完成后: node -v 正常 ，但npm -v就出问题了。

C:\Users\pc>node -v v4.2.1 C:\Users\pc>npm -v ’CALL “%F” “C:\Program Files\nodejs\node.exe” “C:\Program Files\nodejs\node_mo dules\npm\bin\npm-cli.js” prefix -g’ 不是内部或外部命令，也不是可运行的程序 或批处理文件。 2.14.7

虽然能使用，install 指令也能执行，但start指令就报错了！

npm ERR! Windows_NT 6.1.7601 npm ERR! argv “C:\Program Files\nodejs\node.exe” “C:\Program Files\nodejs\ node_modules\npm\bin\npm-cli.js” "start" npm ERR! node v4.2.1 npm ERR! npm v2.14.7 npm ERR! file C:\windows\system32\cmd.exe; npm ERR! path C:\windows\system32\cmd.exe; npm ERR! code ELIFECYCLE npm ERR! errno ENOENT npm ERR! syscall spawn C:\windows\system32\cmd.exe; npm ERR! app@0.0.0 start: node ./bin/www npm ERR! spawn C:\windows\system32\cmd.exe; ENOENT npm ERR! npm ERR! Failed at the app@0.0.0 start script ‘node ./bin/www’. npm ERR! This is most likely a problem with the app package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node ./bin/www npm ERR! You can get their info via: npm ERR! npm owner ls app npm ERR! There is likely additional logging output above. npm ERR! Windows_NT 6.1.7601 npm ERR! argv “C:\Program Files\nodejs\node.exe” “C:\Program Files\nodejs\ node_modules\npm\bin\npm-cli.js” "start" npm ERR! node v4.2.1 npm ERR! npm v2.14.7 npm ERR! code ELIFECYCLE

npm ERR! app@0.0.0 start: node ./bin/www npm ERR! Exit status -4058 npm ERR! npm ERR! Failed at the app@0.0.0 start script ‘node ./bin/www’. npm ERR! This is most likely a problem with the app package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node ./bin/www npm ERR! You can get their info via: npm ERR! npm owner ls app npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request: npm ERR! F:\node\app\npm-debug.log

有人可以告诉我怎么解决这个问题吗？