mostly all of us have the one or the other old PC, sometimes assembled, mostly disassembled. Why not putting new live in the old machine??
Well, I would suggest a nice weekend project called “Install Home Server”.
Step 1: Get the software - http://www.amazon.com/Microsoft-Windows-Home-Server-URP1/dp/B001E5Q8CO
Step 2: Assemble machine
Step 3: Install