Keyboard and mouse stop working

I have an old Gateway model P55C-200 I am working on and need some ideas.
Once booted into Windows, the keyboard and mouse no longer work. I see
during boot-up that Keyboard is detected and Mouse is initialized.
However, I CAN get to the BIOS and the keyboard works fine there. I
navigated to the error log and found time and again 'Keyboard not found', as
the error.
Since I can use the keyboard in the bios and if I start from a boot floppy,
I reformatted the hard drive and reloaded Windows 98 SE. Everything rocked
along just fine until the second restart and then the mouse and keyboard
stopped working.
I'm stumped. Any ideas?

Thanks!
Pam