Oggie, your post #23
Yes, if you've reinstalled XP on your dual-boot machine, it will have regressed the PBR to look for NTLDR instead of bootmgr, hence no sign of Vista, and no possibility of booting it from there.
First step would normally be EasyBCD > Boot loader setup > Install Vista/7 bootloader > write MBR, (if you could get EasyBCD to run), but otherwise you can boot the repair disk you downloaded (or the Vista DVD if someone's located it for you) and run "repair your computer" > "startup repair" three times and let MS fix it for you. Once in Vista, maybe EasyBCD will run without the problems you're seeing.