Did you reinstall from the Toshiba-supplied "System Recovery" CD-ROM, or from some other "retail" Windows XP CD-ROM ?
The Toshiba CD-ROM contains the device-driver.
Toshiba's web-site also contains the device-driver,
for use in a situation like yours.
Within Device Manager, look at the "Unknown Devices" branch.
Expand that branch, then double-click on the '?' device,
and choose "reinstall driver", and allow Windows to connect,
via Ethernet cable connected to a router, or to a cable-modem, or to an ADSL-modem, to the Internet to find and download the correct driver.
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