Re-install NOBU but thinks it's a new computer

In an attempt to fix mysterious firewall errors I'm having, I re-installed NOBU on this computer.  Now when I log in to my NOBU account, it shows two computers with the same name as well as a third with a different name (that one is correct).  It doesn't seem to recognize this as the same one.  If it attempts a full backup of this computer, it's never going to have enough room.  I also don't want it to completely start all over again with a full backup which will take mega-hours.  How do I get NOBU to recognize this as the same computer it already has just a new installation of the client software?

 

Windows Vista Home Premium (with all updates)

NOBU current version

NIS 2012 current version

As far as we've been able to determine in online chat with Symantec, you cannot fix this.  They tell me I shouldn't have added a new computer when I reinstalled the client software but I can't figure out any other way to do that. 

 

Therefore, word of warning...do NOT reinstall NOBU on an existing computer unless you get very precise instructions from Symantec.