2003 Nissan Xterra SE/SC

XOC,

A while back I gave my friend my remotes for the factory security system because I have an aftermarket system. I used instructions found on this site to program his security system using my remotes. Now I'm faced with the problem of every time he comes over his remotes lock/unlock both our vehicles setting off my aftermarket alarm at times. How can I disable those old remotes? Best I can tell, I need to buy a new remote and program it in several times to flush out the old ones....I'd rather note do that. Anyone know of a delete procedure? Google hasn't helped. Can I just disable the factory security system?

Thanks, Rob