Repair network connection does not fix the problem , I have to aasign ip statically

I have got Satellite Toshiba Laptop A-100 that is running Windows XP Profe SP3.

The computer is connected to a D-Link router (DHCP server) that is connected to a cable modem.

Out of sudden the laptopl stopped working on the internet although the network connection is repaired more than one times.

And the same problem with wireless card.

If I assigned static ip addresses to both wired and wireless card they work,,,both of them not only one

Wired card is : Intel(R) PRO/100 VE Network Connection.

Wireless card is :Intel(R) PRO/Wireless 3945ABG Network Connection

I tried to test my laptp on another router (Netgear) which is connected to another ISP same problem is going on with both wired and wireless cards.

What can cause this problem ?

Obviously it is not the ISP (I tried two different ISP), nor cables (because I tried more than one), nor router (because I tried two different routers)