Fix setting Path for Windows

ENV['PATH'] is broken after changing path in windows. It replaces Path in Ruby to path with system variables.
That leads to broken recipes that use executables in System32.

Variant 1 is proposed in this pull request is to replace all systemroot variables to new ones.
Variant 2 would be to change ENV['Path'] separately from changing actual path.
yes, that is why I check key_name.upcase
windows_path recipe uses 'Path' at the moment.

And as for other variables - can be done.