did you try doing it manually?
though if you have xp on the whole drive your going to have to be tricky.
copy any and all files with wpa in the title to a usb drive, external hard drive, sd card, or something of that nature (so you don't have to reactivate windows. It would also be wise to note where you foud them.)
Reinstall Windows XP with the size you want.
Put the wpa files back where you found them.
Install Daryna on the rest of the hard drive. You'll have to partition it manually (i also have an 80gb drive and it wouldn't find the rest of mine.)
At this point you may want to consider this:http://linuxmint.com/forum/viewtopic.php?f=90&t=11872
Or if you don't care to read all that, just make an ext3 partition and a swap partition (the swap only needs to exist you can make it as big or as small as you like depending on how much ram you have, in the other discussion 4 gb total swap and ram was recommended.)