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
http://thpc.info/how/editbootini.html#rbd

Read carefully.

The next link gives sample boot.ini content;
http://vlaurie.com/computers2/Articles/bootini.htm

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

Mark