Some Advice

I want to store the following information in a file:

Username
Passowrd
Administrator

-------------------

Website
Added
Blocked

im ok with using text files - but they can be read and edited from the installlation directory - so they are not a good idea.  I'm thinking about adding Linq database - will it matter that these two tables are not related?  Will I have to add two databases?  And can the database be read from any form in the application?

Or is there another option for stroing and retreiving this information that I'm not aware of? (single or double f?)