Hello. Recently I have ENCOUNTERED several problems on my network...

I have 2 PCs one with Windows XP Professional SP2 32 bits and one with Windows Vistra Ultimate 64 bits both legit.
I have 2 network cards on the XP PC and I use Internet connection sharing to get both PCs online. The connections WORK ok, but I have encountered these problems recently:

1. Computers can't see each other on network. Ping Works, firewall is disabled on both, they are on the same workgroup. What can be wrong?

2. I also have a web server. This morning I could access the server, now from both PCs I can't access the server at all... Ping doesn't go through, server is up and running well(accessed it from 2 other connections, 1 from same ISP and one from a net Cafe and also tried with web proxy). I don't think I did anything to block my access to the server. Any suggestions?

ThanksWhen you say the computers "can't see each other", what do you mean?

It's always worth resetting/rebooting your network switch. Cheaper ones can get themselves in a real pickle. (Expensive ones can too, but less OFTEN...)I can't access any of the computers on the network. When I click View Network Computers the list is blank, when I try to access by IP it says it can't find it.
Ping Works, Internet Works on both.
I tried reseting the network cards, I even deleted the connections and set them up again... still nothing Computer A - IP: a.a.a.a

Computer B - IP: b.b.b.b

To access B from A - on the A computer, at Start->Run you are writing:
\\a.a.a.a
yes? And it does not work?

I still think about those firewalls...

Where is the web server located? In the same LAN, outside your LAN?\\a.a.a.a doesn't work.

Firewalls are off.

So let me explain again....
Computer A (Windows XP)
Network Card 1: IP: Static IP from ISP(Internet Connection) - Shared Connection
Network Card 2: Local IP: 192.168.0.1
Workgroup: WORKGROUP

Computer B(Windows Vista) - IP automatically assigned;
Workgroup: WORKGROUP

Note: If I try to put Ip manually like 192.168.0.xxx , gateway 192.168.0.1, DNS: IP from ISP Internet doesn't work.

Ping from Computer A to Computer B works
Ping from Computer B to Computer A works

View Network Computers empty on both PCs.
//a.a.a.a doesn't work from either PC