Right Click on your My Computer Icon. Choose Properties. Go to the Advanced Tab. Click Environment Variables button at the bottom. You have user variables at the top and system variables at the bottom. The system var's already have a PATH defined. You can just edit that, or you can edit/create one in the user var's. And you can create a CLASSPATH var in either system or user. I would suggest not worrying about the classpath and just specify this at compile/runtime with the -classpath option. It's good practice and when/if you start using an IDE, this is done automatically. Good Luck!