I got sick of my PC regularly crashing, anti virus stalling and needing updates, bloody slow loading.
My solution was to buy a used Mac Power PC, got the box off ebay for $400. This thing is bloody amazing, every time you boot it up the dual fans rev up then come back to idle, its like firing up the engine in your muscle car!!
Updated to the latest Mac OSX 10.8. Never looked back, no viruses, no slow loading, thing starts up every time.
Downside is you have to learn the operating system but definetely worth it. People will tell you all the mac software is expensive but I haven't found it too bad, open office runs on my machine and I can export files as windows extensions.
I have a 8gb usb drive which I regularly back up all my important stuff to but so far so good.
Just my 2 bobs worth
