Grab a copy of Win98... it's not much
chubbier than Win95, and comes with
a bootable CD ;)
Alternatively, try a streamlined distro,
like Slackware, or the Slack-based
vector-linux. Instead of KDE or gnome,
use ICEwm or fluxbox, and you should
live happily ever after ....
The box comes with a pentium 1XX
and 32MB of RAM, right?