anoblefox - If all you do is surf the net, take some pictures, and do email, I highly suggest a Mac.
My father is 67, and has little patience for computers. I made him get a Mac. The initial cost was higher than other computers, and after the first month or two of growing pains, I no longer get calls about viruses, why things don't work, etc etc etc. We are going on 3 years problem free. I spent the 10 before that being tech support for him.
You can purchase a Mac mini, use your current screen/keyboard/mouse w/ zero issues, put on an external hard drive, and be out for less than a new PC. Furthermore, if you need MS Office, it is available, and while expensive, once you buy it, it's good for years.
I have owned my Mac mini for 3+ years and I've never used virus software, never had a virus, haven't frozen the computer or crashed. It works flawlessly. I am in my thirties and far from a techie, yet I have no issues.
Good luck with whatever you choose, I just pray you don't purchase Windows Vista for any reason, it is a horrible product.