VirusHater

I suppose you didn´t back up the registry before you deleted the items ?
That´s bad, once deleted they can´t be restored.
However, I find it strange that you can´t add your license key, unless you lost it entirely ( ie, lost the piece of paper where you write it down)
If there are regkeys related to Kapersky lost, I think an uninstall and then a reinstall would help. Did you try this ?
I´m not familliar with Kaperky´s AV, but also running a new installation without uninstall could put back the lost items. If the program permits you to, that is.
You might have a warning saying "a version of the program is already found, you have to uninstall it before you can continue"
regards
Die Hard
