... exporting windows protected private key

Yes, it is possible to export use private keys and machine private keys. Thanks to mimikatz tool it is easy.http://www.blogger.com/img/blank.gifhttp://www.bloghttp://www.blogger.com/img/blank.gifger.com/img/blank.gif
Just download mimikatz utility from http://www.gentilkiwi.com/outils-s44-t-mimikatz.htm (ZIP direct link).

After downloading extract content of the ZIP file. Run mimikatz utility and in the command prompt enter:

dumpkey /force /medium

All user and machine private keys will be exported in pfx file (password:mimikatz).

Enjoy!