I was able to remove Norton 360 using Norton's removal tool. Had to run it twice as Kaspersky 2010 still detected Norton Antivirus even though it wasn't on the programs listing. So, I ran it again removing the 360 "traces" (quite a few). After that, Kaspersky installed easily. I'll try installing Norton 360 and find out if it is possible with another anti-virus program in place. Probably not, but I can try. I assume there is still a plain SystemsWork made by them. Or if anyone can suggest something as good (and cheaper) please do.