chmcgee, Hi and welcome to HTG forum. You cannot uninstall Win Defender in Win7 or Vista, as it is integrated into those operating systems, unlike XP where you can uninstall Win Defender. All those alerts, I believe, could be coming from Security Center located in the Control Panel, which you can change the way Security Center alerts you. But, that will not solve your initial problem, only rid you of the prompt annoyance.Being not familiar Norton products,if it is a Suite and includes anti-spyware functionality, I would reason that Norton would turn off Win Defender.I use Microsoft Security Essentials, which turns off Win Defender, because it has its' own anti-spyware.
If you are sure when you installed Norton, that, Windows Defender was running alonside with Norton, may I suggest turning Windows Defender on by going to the control Panel-Administrative Tools-Services where you can double click on windows defender and stop and restart the service, and make sure it's set to Automatic or Automatic/Delayed Start. Reboot and see if this resolves your issue.
Personally, I would not use any kind of 3rd party program to tweak Windows, especially in Win7 and Vista.I used a few well known tweakers in XP and had nothing but problems. See if you can go into the program and reverse what you tweaked or maybe it might have a "Set back to defaults" setting you can use.Then, uninstall it...Garry