Apple or PC?

Apple or PC?

I think, no, I know my computer is about to die. It is sooooo slow! It is as slow as dial up and I am on broadband. I took a bunch of stuff off of it to free up some memory. It didn't really help. Could it be that it is ancient and operating on Windows 2000 Pro? I realized when I was fighting with it a couple of weeks ago that that meant the operating system was actually nine years old and maybe it was time to consider a new system.
So, PC or Apple? My daughters love the Macs! My sister is a Mac person and so are several of my friends. Ariel and I went to the Apple store last week and browsed. I was amazed at the new IMac and ever since then I have been coveting one. It does so much! Plus, the whole thing about it, I am told, they rarely, if ever get viruses and that is a real selling factor to me.
The problem is, there are several sites I use in my business that require Internet Explorer and I don't think Firefox will work with some of them. I have tried to use them on Mozilla before and it just did not work. I know you can run Windows/Internet Explore on a Mac, but my question is, does that open up your Mac to a higher risk of getting a virus?
If you have any opinions, comments or experience you would like to share with me, please do.
I really like that IMac......