Hello friends...i have two PCs (say A & B) both running windows vista. A contain two lan cards so that it can SHARE internet connection. Internet is working fine on both computers. B can access and get data from A. now the problem is, when A try to access data from B, network disconnects and restarts AUTOMATICALLY (network). Every time same problem occurs.

Due to same reason i can't upload any file on internet using computer B, coz network disconnects (as told earlier)...

Plz help me guys...seriously i don't know what the *censored* is going on with them...
The reason why is disconnect is because it requires an IP address to upload/Download and browse the internet, therefore it needs to renew or get and IP address from the modem. So if A computer has the public IP address and then you would LIKE the B computer to CONNECT to the internet it will take the IP address from A to use it on B.

You only solution will be to purcahse a router with 4 port. Thnx for d reply, but to AVOID using router i am using two lan cards in computer A (one is connected to internet which is shared and other to my computer).
Internet is working fine in both but i can't upload nething on net using B (it disconnects when big file is to be loaded, then restarts).

This thing worked perfect in past, now i think there is some problem in firewall or anti-virus (AVG) in A, but i am not able to detect it...