but it included into v7, since I don't know what version you are on. You need to open up a mmc to the certificate store.
Start -> run -> mmc
Add\Remove snap-in -> Click Add -> Computer Account -> Local Computer
Certficate snap-in should now be loaded, click close and ok.
Expand the certificates tree, and you should see Altiris licensing and and certificates folder. Highlight the certificates folder, and you will see all the Altiris licenses you have applied over time.
You can delete some or all of them, and then go back to your licensing page on the console and reload your correct licensess.