Virus software

[Dee]

When I got my new computer, it came with McAfee software
preloaded. I wanted to try it, so I installed the
personal firewall. I have had trouble with my internet
connections ever since. I decided to uninstall it so I
could install my Norton Utilities, but I keep getting a
message that the install.log could not be opened. As a
result of my inability to uninstall the McAfee firewall,
I cannot activate some of my Norton utilities. How do I
uninstall the McAfee firewall?