I am curious of how the private key was generated randomly. Usually PGP systems will use mouse movement or such. If it was generated without user interface and used the cpu algorithm then it is only pseudorandom.
On unix systems, it appears OpenSSL uses /dev/random or /dev/urandom for [pseudo] random number generation. It looks like it does something a little different on windows.
http://www.openssl.org/support/faq.cgi#USER1