Today I purchased ZoneAlarm Security Suite 3-User Renewal. I successfully installed it on one computer. I have not been able to install on second computer which has previous version of ZoneAlarm Anti-Virus (not Security Suite). I keep getting message that I have to have administrator privileges. There is only one user on the second computer and I do have administrator privileges. What do I have to do?

Operating System:Windows XP Pro
Software Version:7.0
Product Name:ZoneAlarm Internet Security Suite