example is nod32, but kaspersky is not bad too in tis category.

Bro, how your friend install so many protections in one OS? I tried it but end up conflict.
When your purchase Kaspersky AV/IS, there'll be different packages for different amount of licenses. If you format and reinstall the KIS, you should be able to reactivate the original license key again as long as there's still some more duration (days/years). I'm not sure about KIS but my friend bought a KAV 2008 for 1-year, 1-user for RM10.