user1234567 wrote: I cannot find anything related to this topic in google.
Are you crazy!? Look at the image below and change 7 to XP in the search string for XP
Fix the Firewalls first!
Once you've fixed the Firewalls and can successfully ping then you know other communications are possible however you may also have to make allowances for them as well!
The bottom line is all your questions and the answers to your question have already been asked and answered ad nauseum on the Internet and Google has the answers! You need to review some online tutorials on basic networking and there are hundreds of them on the Internet!