My Laptop and PC are networked. Connected to ADSL modem. Using Zone Alarm 6.5.737.000 Free version.
All of a sudden tonight both machines started to give me this warning:

Windows System Error
There is an IP address conflict with another system on the network.

IP address of my Laptop always finishes with 33
IP address of my PC always finishes with 34

Now they both finish with 33....I suppose this is the problem...
I have no idea why and how it has started.

Eventually I got disconnected from Internet, when I disconnected laptop cable from the modem, I was able to connect to Internet by my PC.

Help Appreciated.