How to Set Environment Variables

http://support.microsoft.com/kb/310519

To view or change environment variables:

1. Right-click My Computer, and then click Properties.
2. Click the Advanced tab.
3. Click Environment variables.
4. Click one the following options, for either a user or a system variable:
• Click New to add a new variable name and value.
• Click an existing variable, and then click Edit to change its name or value.
• Click an existing variable, and then click Delete to remove it.