We don't use this box often. It's old, beatup, has no keys, (we use a usb keyboard), and has only 1 gig ram. I still like it. I usually use my old asus board 8 gig ram and Phenom II processor. The 1521 is sort of weird. I guess it was built for windows vista but win 7 runs on it. I think all I needed was the vista video driver and maybe the dell wireless package to run 7 comfortably. winxp was a nightmare. don't remember if I ever got all the drivers for xp.
This box has run a lot of nix's. several *BSD's. I think slackware-current x86 and x86_64 kernel wants too much of it though. The older slacks run fine. devuan 3.16.0-4-686-pae runs smoothly. Could do without the pae as it has so little ram.