背景：之前建個人站點gnssinfo.com曾從網上download了一個開源的python 2.x版本的工具，用來從163上下載blog；
這兩天把python 2.7刪掉，然後安裝最新版3.3，無法啟動，換裝3.2同樣無法啟動，均提示以下錯誤：

Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can’t find encoding

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application’s support team for more information.

用控制檯啟動，查詢版本，報如下錯誤：

E:\Python32>python -v
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can’t find encoding

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application’s support team for more information.

百度不給力，google了N久，終於在python.org網站上找到答案，具體頁面為：http://bugs.python.org/issue11288
原網頁提示解決方案如下：

I have found a problem and sollution:
previously I have used Python 2.x and when I removed that version and next installed Python32, PYTHONPATH in system variabled indicated still to Python2.x. Removing all python paths to old version solved the problem.

與筆者電腦上問題一樣，找到系統高階環境變數設定，將PYTHONPATH更改指向E:\Python32目錄。重新從選單開啟IDLE（Python GUI）即可啟動。
IDLE啟動後，介面提示資訊如下：
Python 3.2.2 (default, Sep 4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)] on win32
Type “copyright”, “credits” or “license()” for more information.
>>>