You write you fetched Marvell drivers but it sounds like you are not using those issued by Toshiba from the web site for your make, model laptop.
Such mix and match approaches don't work well. I'd arrange for someone to give you an EXACT AND DETAILED XP INSTALL PROCEDURE with a fine example from 7726-7587_102-2699006.html
Notice how specific the steps were? If folk guess their way on drivers, odd things happen.
After months of frustration with the wireless connection to my Toshiba Tecra A3 laptop (XP SP3) dropping out, I connected it to the router with ethernet cable. I downloaded latest drivers for the Marvell Yukon adapter, then I set up the network.
The problem is that when I boot up the laptop, the connection is not seen, but as soon as I reboot, it displays. It then shows an IP address and operates at full 100Mps, and can be pinged from other computers in the house, and connect to them.
I have tried with the wireless connection both enabled and disabled, but no difference with the cable recognition (the wireless displays immediately, when enabled).
Why won't it connect first time?