win10安裝node后，npm不能使用

win10系統(tǒng)安裝node成功后，node -v能出版本號(hào)，但是npm不能用，報(bào)錯(cuò)：

Error: spawn D:\nodejs\node.exe ENOENT
    at _errnoException (util.js:1031:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:201:19)
    at onErrorNT (internal/child_process.js:389:16)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
    at Function.Module.runMain (module.js:684:11)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:613:3
D:\nodejs\node_modules\npm\lib\npm.js:51
      throw new Error('npm.load() required')
      ^

Error: npm.load() required
    at Object.get (D:\nodejs\node_modules\npm\lib\npm.js:51:13)
    at process.errorHandler (D:\nodejs\node_modules\npm\lib\utils\error-handler.js:205:18)
    at process.emit (events.js:159:13)
    at process._fatalException (bootstrap_node.js:382:26)
5.5.1

events.js:136
      throw er; // Unhandled 'error' event
      ^

Error: spawn D:\nodejs\node.exe ENOENT
    at _errnoException (util.js:1031:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:201:19)
    at onErrorNT (internal/child_process.js:389:16)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
    at Function.Module.runMain (module.js:684:11)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:613:3

只要使用npm命令就報(bào)這個(gè)錯(cuò)，求大佬告訴一下這什么問題，怎么解決。