http://java.com/en/download/index.jsp
- Press the Windows Key
- Type "environment"
- Select "Settings" from the Menu
- Select "Edit environment variables for your account" from the results
- From the "User variables for USER" box select "Path"
- Press the "Edit..." key
- Append onto the existing Variable value ";C:\Program Files (x86)\Java\jre7\bin"
- Press the Windows Key
- Type "Command"
- Select "Command Prompt with Ruby on Rails" from the results
- From the Command Prompt type "gem install ruby-processing"