Alternate method:
Press Windows Key + R
Paste explorer.exe shell:::{8E908FC9-BECC-40f6-915B-F4CA0E70D03D} or the command previously provided above.
After testing, Create a shortcut using either one of those commands and assign it a hotkey sequence... use said hotkey to launch in the future. Check out %SystemRoot%\System32\netcenter.dll for viable shortcut icons...
While this, of course, doesn't fulfill your "use everywhere" requirement, you could create an installer batch script on a flash drive and bring that everywhere with you.
Realistically, the fastest method (for use with any Windows 7 system) might be to press the Windows Key, type sharing, and press Enter... as Network and Sharing Center will be highlighted.