Check the license agreement to see how many computers are allowed to have the software installed at a time. This information may be in the manual or on the software CD.
Put the software CD in the drive of the additional computer. Click the installation option. You may see a option to reinstall. If so, choose this option.
Enter any required information during installation such as a serial number or activation code. On some applications you may be asked to enter some information from the credit card you used to purchase the software.