Well, using Windows supposes you have money. So if you have money to buy windows, you'll have money to buy a new multi-function printer :) (I never gave any cent to MS btw).

As for WAMP ( windows + apache + php + mysql + postgres + python + phpmyadmin + mysql and postgres admin software) it takes just one download and 3 clicks. Beated :) As for GIMP, I just don't use it.

As for the out of the box experience, it's the same of having a compaq computer (I had one and my father another) and they come with a CD including the windows and drivers (called QuickRestore), probably HP doesn't make them anymore, nor sure. When you use then, you have your computer just like you bought it: Ready to run (just like Apple). Yes, you are paying for the OS, but when you buy a mac, your are also paying for os X... As for linux, with the lastest Ubuntu, I didn't have a out of the box experience with my desktop. There are still many hacks needed to make things work (see my post regarding it).

As for antivirus and stuff, I never had a female friend asking me to format the drive due to virus problems. As for guys, you should already got the cause.