Lone Rider, if you have had your system for more than 2 years, you probably have 512MB or less of RAM. The first thing to do is upgrade your memory to at least 1GB. Don't worry, RAM is very cheap and easy to install yourself. Just make sure you unplug the power cable before installing it.

The difference after you add a GB of RAM will be considerable. There have been a lot of changes in XP in the last few years due to updates and service packs. When XP first appeared it would run on 128MB of RAM. Not anymore.
If you want to clean your system of old files and other crap that builds up over the years, download a program called CCleaner. It does a great job. Spybot is a very good program for removing spyware and such but it is best to use it in combination with another program. Some like Ad Aware but I prefer one called SuperAntispyware. You can find both of these at
www.download.com. One will usually find stuff the other one missed.
If you run Spybot in advanced mode you will be able to see all the programs that load at startup. Many of these are totally useless and only serve to slow down your system. Spybot will be able to give you a description of what these progs are and you can disable them with a click of the mouse. If something goes wrong afterwards, or you realize you really need one of the things you disabled, it just takes another click to put it back.
Personally I would never even consider a Mac of any type. I like to tinker with my system and have the availability of tons of hardware products to upgrade if and when I choose to do so. This is something you can't really do with a Mac. I also enjoy the large variety of software available for a PC, whether free from the net or commercial programs. Just go into any futureshop and compare the available programs for PC and Mac. And besides, there must be a reason that all the Mac owners seem to be loading XP on their systems to be able to do the things that OS/X can't. Makes me wonder why they bothered buying a Mac in the first place.
I love this video about Macs, it's very accurate actually. There are a few of them on this page. Check it out.
http://www.youtube.com/watch?v=axC-7O4Yq-w
vtguy, if everything that was talked about at Black Hat conferences in the last few years had come to pass, every PC in the world would have long since ceased to function. Try reading the comments on the article you posted to get a more realistic view of things.
Linux, while fun to play with, is no where near useable for the average, and even for most above average, home computer users. It is great as a web server or as a firewall box and for many other things. But it is in no way a suitable replacement for Windows or even Mac for the average user.
Techman