claviertekky said:Get a Windows 7 CD/DVD/USB drive.
If you need to make a bootable disk via USB for Windows 7: http://store.microsoft.com/Help/ISO-Tool
Boot it and select repair my computer.
Thanks for the advice! I've since fixed it (I believe) by just reformatting that partition and starting anew. I've now got XP working just fine, but the Windows 7 install is basically inaccesible. I tried using DualBoot Pro to repair the boot files for 7 that were overwritten by XP, which worked, but it doesn't recognize XP anymore, only 7. I can manually change which drive to boot into from 7, but it's just a pain since it requires two restarts.