On Windows 8 (64bit) glances display 
[before]
- python 32bit : Windows 8 32bit
- python 64bit : Windows 8 64bit

For getting 64bit (the operating system is 64bit) the solution is to check if the environment variable PROCESSOR_ARCHITEW6432 exists.

[after]
- python 32bit : Windows 8 64bit
- python 64bit : Windows 8 64bit