Edit: I will read the thread before I post...Originally Posted by Drew
About the installer: Did you completely remove the old install, or are you trying to install over it? If you didn't remove it, do so, and try the install again. If you did remove it and it doesn't work, I suggest you try a newer release (Dapper, Edgy).
For XP: Is this a Grub error? Do you use Grub? I have a feeling you do, so you may need to edit the config file (I think Ubuntu uses menu.lst for it). When you get a working install (or boot the command line) in the terminal or booted command line, type "gedit /boot/grub/menu.lst". You should either get a new window with a text editor and the config file, or have it just appear on screen (depending on if it was accessed through X or not). For the Windows option, it should have something like this.
That should tell it to boot Windows (if it even was a Grub error) and if that doesn't work, I don't know.Code:title=Windows XP rootnoverify (hd0,0) makeactive chainloader +1