When I went to primary school in 1995 I remember the school had a classroom full of old computers. It took the school 2 years but eventually they did replace them with more modern systems. The two things I remember of these old boxes was the pipe game and the moonlanding game.
The pipe game gave you 30 seconds to start laying pipes before the toxic waste began to flow and then you had to keep it flowing for as long as possible by laying tiles. The moonlanding game I remember as being hard, you had to use the arrow keys to keep it from crashing.
I do think these were windows systems; I would be really curious as to what systems these could have been.