Most definitely...I am not a Mac user....I browse with Xandros....Linux....and am having no problems with spyware..... I also have a couple of Xindows XP machines used for the normal sort of things that windows is good at....I just don't let them get on the internet and browse with them....
I am solving my problem with multiple machines....rumor has it that apple is about to announce a sub $500 machine that might be an answer....KVM switch and use current monitor and keyboard mouse between the two machines....one machine is never enough...
Sounds like you're having trouble with some machines with minds of their own! ;>)
Are their Mac versions of the anti-spyware software listed above? I am full of questions because we are getting a Mac next week. I use my work laptop now, and it goes through my company intranet first, which has mega-firewalls and security, so I am almost completely pop-up free right now. Don't want to get into trouble with our new Mac!
VNC is cheaper, and perfect for lazy folks like me - unlike KVM, you don't even have to flip a switch ;)