Which windows to run?

My grandma has an old computer that she is wanting to use as a word
processor. The system is a Dell Optiplex, 300 Mhz Pentium 2, with 192
MB of ram. I installed Win98 on there, and it took FOREVER. 14 hours
to be exact.

Now that it is installed, it runs horrible, and every single click or
action takes forever. The box meets the minimum system requirements,
but I still can't get it to run right.

Should I buy a copy of Win95 instead? Is it possible that would run
better, or is it more likely the box just has a hardware issue?

Thanks!