No mouse/ keyboard after install driver

Upgraded WinME Gateway system to XPHome…all went fine.Then tried to install updated Keyboard driver for XP. That processed locked up computer and subsequent reboots provide no keyboard or mouse. Tried to recover last known config but still no mouse or keyboard. How can I reinstall original drivers or entire XP? Can’t use Safe Mode w/o keyboard/mouse. Can I restore driver from DOS prompt using packed file in i386 folder on XP disc?…if so, how?