Font Creator makes and modifies True Type fonts that you can use on any version of Windows from 3.x forward. You can use scanned .bmp files, convert them into a True Type outline for making your own signature True Type font or dingbats. You can undo and redo an unlimited number of times, and once you're satisfied with your font, you can install it on your system via the program's toolbar.
Online tutorials are available and High Logic's customer service seems quite good.