Hi, My first post here will hopefully help someone. From your sig you are using XP. Boot from your XP install CD. Go to Recovery when the menu comes up. In Recovery there are numerous commands. One is fixmbr and the other is fixboot. It will warn you about screwing up other Partitions if you use fixmbr, so make sure you remove and unbacked up important data before you execute fixmbr.
And, in you CMOS, make sure you drive boot order is correct.
M$ has a nice list of the commands if you care to search for it and then print it out.
Ron