win7&64下setuptools安装失败怎么解决

显示如下
............
File "C:\Python27\lib\mimetypes.py", line 358, in init

db.read_windows_registry()

File "C:\Python27\lib\mimetypes.py", line 258, in read_windows_registry

for subkeyname in enum_types(hkcr):

File "C:\Python27\lib\mimetypes.py", line 249, in enum_types

ctype = ctype.encode(default_encoding) # omit in 3.x!

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 33: ordinal not in range(128)
网上遍寻无果，就这一个http://www.oschina.net/question/1409342_134600，里面的方法都试过，无效。