Installed Metasploit on Windows, 3 Ruby processes spinning CPU at 100%

So, this is my very first encounter with both Ruby and Metasploit.

I have used the default installer for 64bit Windows7 for Metasploit.
Installer finished, but 3 Ruby processes appeared, that were eating up
~100% CPU.

Restarted my computer, and as soon as Windows logs on, 3 Ruby processes
start again at 100% CPU.

I have found a couple pages related, but they were either Linux/Unix OS
or very old.

I am still Googling for solution, but maybe somebody here can explain to
me what is going on, and how to fix it?