Usually, that Lilo error (L 01 01 01 etc) means that either you're trying to boot from the wrong drive, or that your MBR is hosed.
Check to make sure you're booting from your primary master drive - the one with Windows on it.
If you're booting from that drive and the problem persists, you need to re-install Lilo. You can do this from the rescue program on CD1 of your install CD's.
If you boot CD1 normally, and then press F1 for 'expert' options, it'll give you the boot paramters there to boot to the rescue program. It's then just a case of following the program through to re-install your bootloader to the MBR.