How do I remove NIS2008 from one of my PC's

I had NIS 2008 installed on 3 PC's as per the multi-user allowance.

 

One of my PC's has broken, and I wish to install NIS2008 (then renew to 2009 upon re-subscribing) on my new PC.

 

I am unable to uninstall NIS2008 from the PC in question which would be the usual way to do it as it will no longer even boot up.  How do I deactivate the PC in question from my 3 PC entitlement in order that can then install it on my new PC, but still remain within my 3 PC entitlement??