Windows 98 driver searching problem

Hello,
My grand mother owns a very old personal computer.
They bought it in 1998, I think it still is functional. It runs on an Intel Celeron processor.
I wanted to surprise grand ma and let her see that her old PC is working.
Are there still OS that can run on an Intel Celeron? or is Windows 98 still available?
If so, will I have drivers if I still use windows 98?
