Creating a password protected document in Word

In Word, you can definitely create a form and lock it with a password so
that users can open, view, fill in the fields and save the form with
the data.

Create forms that users complete in Word (from Microsoft)
http://office.microsoft.com/en-us/help/HP052302701033.aspx

Creating a Form Using Word (from Penn State Erie College)
http://www.pserie.psu.edu/compcntr/guides/wordforms.pdf

The basic steps are:
1) Create the document
2) Enable the Forms tool bar
3) Add fields, pull down combo boxes, and check boxes
4) Click on the lock on the Forms tool bar
5) On the Tools menu, click Protect Document
6) Enable the "Allow only this type of editing in the document" check
box, and then click "Filling in forms" in the list of editing restrictions.
7) Click Yes, Start Enforcing Protection.
8) Type a password in the "Enter new password (optional)" box, and
then confirm the password.

Save and distribute the form, knowing that only people who have the
password can actually make changes to the form. The rest of the users
will only be able to fill-in the form and save it.