Problem or not?

I have a D-Link router and one computer that is conncected to it with a wire and the other computer is wireless conncected. I have the standard windows firewalls. One of my computer is not working right and I am getting ready to reset it. I was wondering if I needed a better fire wall or some type on network security? Also if I do how would I go about setting it up. Not sure if I set up the network right and was wondering if any could help me make sure I set them up right and make sure that they are secure. Also if there any I can do other then make it so they can use each others documents and shared documents. Mostly worried if my computers are secure with my wireless router and no one else can axcess my files. I basically set up a net work and right clicked documents and went to sharing and clicked allow network users to share and change my files. then ran all the set a network up wizard stuff, and scaned for computers on my network and it put 4 files in my network place both computers documents and shared documents. I did not set up any security up my self other then avast and spybot search and destory. So I was wondering if any can tell me I if I set them up right, what else I can do with a network, and about security.

 

I will just take that as a no, but does anyone know how to set the trust zone? Also sorry about the triple post not sure how to edit old post.

 

You've asked a lot of questions without supplying much in the way of specific information as to what if any problems you're actually having. Most readers are probably overwhelmed at the prospect of having to write a lengthy post teaching someone network setup basics, and just choose to move on. Do a search on some posts by member "cat5e", who often links to a networking setup information website in his replies. His profile's here:

http://forums.majorgeeks.com/member.php?u=9479

 

i got a simple one y can't I sign on to aim now that I downloaded zone alarm free?