and I have never had to do this myself so you try it at your own risk.

Others here may have a better solution.

The link below takes you to a web page that suggests two utilities;

THPC's Rescue Boot Disk or Use EditBINI

Read carefully.

The next link gives sample boot.ini content;

Not to rub salt in the wound, but your comment about 'important files' inevitably leads me to ask, "where are your backups?"