The next step is pretty easy. You cann either do a search on Linux Questions regarding this(search for L99) and you will find this problem discussed to shreds.
You need to get a windoze boot disc(floppy). Boot from it and type
fdisc /mbr
That will erase your mbr. Now you can boot from your Linux cd, it will have a rescue utility which you can use to reinstall lilo. Problem solved
Cheers.