Network file sharing[how to stop it]?

Question

I believe after finding lewd words I have typed in [porn] on another household computer unless I forgot to clear my history and all these suspicious coincidences don't mean anything i'm being monitored probably over my dlink router. I really SERIOUSLY NEED YOUR HELP. How can I figure out how I'm being monitored what should I do next time I have access to that other computer to confirm it has some monitoring tools on it. I can no longer access workgroup computers for some reason my computer is under shared network but I cant see the computers connected to me. But in this screenshot of various things iv looked up it says my computer is not allowed to be shared but this makes no sense. Tell me all the precautions I can take so no other computer connected to mine over my router can acess my internet history folder or my computer in general. What firewall is easy to configure so I can block any other ips but mine going through my computers files. What can I look up and check on my computer or the other to see if I'm being montired and if another computer has access to this one? Please I'm willing to try anything no matter how complicated. In my dlink config screen where I type in my ip to access it can I put in the other computers IP 2 block it from accessing my computer? What would you all do ? http://img338.imageshack.us/img338/5...ageshakef3.png
and this...don't know if this is a plausible idea or not. Just looking through his history it matched identically to mine. It was strange...I only caught a glimpse but 2 sites were the same. How do I stop all access to my computer . It must be possible even if hes set up passwords to over ride it and give me back access to controlling my network connections.http://img388.imageshack.us/img388/91/canitn9.png

http://img141.imageshack.us/img141/3687/dasrsdqo1.png
being monitored how do I disable this?

Answer 1

OK, listen. I cant follow your situation, but try this...

http://www.ccleaner.com to clear out completely your history. Check them all on the first page.

http://www.belarc.com to inventory ALL software on the computer. You will see versions and locations.

http://www.winpatrol.com to manage all startups, services, and your HOSTS file.

http://www.superantispyware.com is good at catching keyloggers and other spyware related issues.

http://www.zonelabs.com for a decent bidirectional firewall.

Right Click on My Computer and select manage. Open Local Users and Groups then Users. Disable any user logon you dont use.

Make sure you do ALL windows updates, and read all instructions on the above software before you install. You should be locked down pretty good.

Passwords - At least 8 characters, One capital latter, One number.

Email me if you need more suggestions...