If I remember correctly there are 2 ways:
1) Redraw the form as a Master/Template in Word - not the greatest idea, but can be smart if you really want to use it a whole lot of times,
2) Acquire (legally of course) a software package that can do aforesaid scan and conversion
There are quite a few - some better than others:
Just did a quick scan of the Web and got this on the first page of the first Google query
Try this
Good luck, if you scan around and try a few - let us know what you found to be the best - or if you find a survey - the location of the results - thanks. Gofer