NIS upgrade to NSBU

Quick question, I am currently running NIS 21.7.0.11 and have about 2 months left on this subscription.

I just picked up a copy of NSBU 2.0 and will be converting over to this once my current NIS subscription runs out.

My question can I load NSBU 2.0 right over NIS or should I first uninstall NIS before installing NSBU?

My system is WinXP 32bit, SP3

Thanks for your reply,

BYota