a/v firewall: nod internet suite
just a/v: nod
just firewall: i use kerio personal firewall but i'm pretty sure there are some better ones out there
registry cleaner and os tweaks: yamicsoft
trash disposer: ccleaner. rarely use it to registry clean
defragmenter: ultimate defrag. i consider this to be the best
just spyware cleaner: spyware doctor --- resource hog and boots up slow but it's really good
uninstaller: smarty uninstaller. i'm pretty sure there are better ones out there but i'm used to this.