did you try booting in to safe mode? you should be able to. From there you can reinstall video driver.
Pentium 3 1000 @ 1195, Abit bx-133, 256 Mb Mushkin Rev.3 cas 2-2-2, Leadtek GeForce 3 Air Cooled. 
AMD Thunderbird 1.33 @ 1.5 (24/7) IWILL KK266R , Corsairs pc 150 cl2, Leadtek GeForce 3 