Network / Sharing :: Access To Shared Resources On Network

I have two pcs: an old desktop pc with windows xp and a notebook with windows 8.

Both computers are connected to the Internet through an adsl router and are also connected togheter, sharing files and folders through plain networking: HomeGroup would not work with windows xp.

Therefore, both computers are under the same workgroup, have different IP addresses and both share printers and folders.

I am able to log into my notebook [running windows 8] from my desktop pc [running windows xp] but not vice versa.

When my windows 8 machine prompts me for user name and password to log into my windows xp machine, my user name and password are not recognised.

I tried setting up the same user name with the same password on both machines, but whilst now I am able from my Windows XP machine to log directly into my Windows 8 machine, without entering user name and password, I am still receiving the 'The user name or password is incorrect' message from my windows 8 machine.

In both machine I installed Comodo Internet Security. I set up Comodo Firewall in my Windows XP machine to receive Remote Desktop connections.

Now I am able to connect to my XP machine from my Windows 8 machine via Remote Desktop. I am still unable to log into it from the Network folder, though.