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The Drop!
Taken
If you have an XP Disk, you should be able to still try a fixboot and fixmbr with it by booting into it, and into the recovery console. You can also give EasyBCD a try during your repair efforts.
It sounds like your mbr (master boot record) and possibly your partition tables got screwed up. You should also try using a bootable cd to check your partitions. Make sure the windows one is set as Active and Primary. Also make sure it's not set as invisible, sometimes when dual booting the boot manager will set the other OS's partition as invisible / hidden.
Here's a nice set of tools to use too. If a simple fixboot/fixmbr doesn't fix it, this is the type of thing that can usually take a while to sort out the exact problem, with a LOT of rebooting.