I'm trying to uninstall Norton Enterprise on a new machine running Windows 7. I ran the Norton uninstaller (the full uninstall), but it's still interfering with my Kaspersky 6.0 installation. I've rebooted and checked the Windows Programs. Guesses?
When you said you used the Norton uninstaller, are you talking about the one that came with the product?
If that is so, I recommend you download the Norton Removal Tool, then go in to Safe Mode as Tom Wijsman suggested (Press F8 a few times as soon as your computer turns on and before you see the Windows Flag.), then run this tool.
Hopefully it will remove every last shred of Norton from your system and allow you to install Kaspersky.
However, that being said, I just did a quick look around, and version 6 looks to be the version from 2007, they are on version 11 now. I doubt 6 will still be compatible with Windows 7. This may be the issue as to why you can't install it, rather than Norton interfering with it. (Unless you can give a screenshot/or exact error message?).
All this being said, I would highly recommend you take a look at Microsoft Security Essentials, which will give you free, up to date and good antivirus.