If Windows 8 installations are on MBR disks you can try "Dual-boot Repair" tool that comes with Visual BCD.
Just click on "Automatic Repair".
If your installations are on GPT disks then for repairing you have to take manual steps:
Use "bcdboot.exe" utility to fix booting for both systems (read...
There should be options in firmware to choose
device(hdd) and legacy(BIOS) booting for XP disk (MBR format)
and UEFI for Win7 if installed on GPT formated disk.
Only Win7/64 can be installed to boot UEFI/GPT way.
Windows 7 boot manager is \bootmgr.
XP boot manager/loader is \ntldr...
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