maya 2011~2012 license error 20 on Windows 7

我還是第一次碰上安裝maya的時候發生下列錯誤訊息

License was not obtained
Tried Maya 2011 (657C1 2011.0.0.F), error 20

License method:
environment variable MAYA_LICENSE_METHOD=’standalone’

Product choice:
environment variable MAYA_LICENSE=’unlimited’

License file override:
environment variable MAYA_ALT_EN is not set

不過還好有google，不然還真不知道如何解決

解決方法如下列網址
http://blog.sina.com.cn/s/blog_4bb4f0250100rg5z.html