If it doesn't work the answer seems to be "no". Anyway, it's not a Windows 7 question, but a question for Kaspersky's customer service. What do they say?
Why did you buy the wrong license key?
I have bought a license key of KIS 14 but I have KIS 15 application in my laptop and don't want to downgrade the version of Internet security. Is there any chance/trick to use KIS 14 key in KIS15 application ?