My main computer is a Compaq desktop I bought in 2007 or 2008 running Windows 7 x64. AT one point I was dual booting with Fedora 14, but I rarely logged in to that half, so eventually I just made it pure Windows after the hard drive crashed irreversibly.
My laptop is a hand-me-down Dell Latitude (only way I'd ever own a Dell) and it's running Ubuntu. Apparently the previous owner wasn't impressed with Dell's ability to be fixed either.
Within the next few years, I'm going to build a computer to replace my current one.
As for free programs, I have plenty I like. AVG for anti-virus, OpenOffice or LibreOffice and they're menus so I don't have to deal with Microsoft Office's pretty little buttons, GNU Cash for my bookkeeping, Notepad++ for my coding, and FileZilla for FTPing. The other favorites are more art based, like SmoothDraw.