If you still have an old PC, you're in luck. A new Linux distribution based on Lubuntu will give any old PC a new lease on life, designed for non-technical users and optimised for popular web sites.
We've covered some ways of installing Linux on an old Windows XP computer before. Xtra-PC makes the process easy for non-technical people -- and it comes with a lot of popular software set up out of the box. You can run the product off the DVD or a flash drive, or install it directly to the hard drive (erasing the old operating system). I tried it on a few different XP-era computers and didn't need any drivers. Even wireless and Ethernet worked perfectly.
Xtra-PC includes links for Facebook, Minecraft and Netflix, and optimises Chromium with the correct plug-ins. Other web-based products like Google Docs work just like you'd expect with any other OS. You could do this yourself, of course, but for $US15, Xtra-PC does it for you and provides support -- perfect for non-technical people who need an extra computer that's less likely to get viruses.
Xtra-PC ($US14.99 DVD, $US9.99 Download)