And what works on Windows doesn't seem to carry over very well, ie, even Intego has trouble and causes a performance hit.
With Norton, maybe the best advice is to check out their own Community Forum, keep it away from normal production or system for daily use, and set it up on a TEST CLONE. If OS X could be test run in a VM that would be dandy, but can't, where all changes are discarded when shutdown.
ESET NOD32 forum any help?
http://www.wilderssecurity.com/forumdisplay.php?f=15
Snow Leopard compatible? I noticed OP said they used Drive Genius 2, and I am pretty sure you need to upgrade to DG3 to be safe, same as every OS update where Disk Warrior and TechTool Pro had to be updated. (There is Data Rescue 3 as well.)
People often say that they don't see the need for uninstallers and that is a PLUS over Windows. I kind of like having a central location and means to uninstall scripts trigger from a Programs control panel.
Another way to "uninstall" is to rollback to prior to point in time. There aren't any such "Sandbox" tools though where you can setup and then test and when done, tell the system to undo everything.