now you can downgrade your toshiba Satellite Pro A300 to windows xp.

Intel Chipset Driver for Win XP
Size: 2.15 MB
Download: csutil-20080805075054.zip

Intel AHCI SATA Controller Storage Manager Driver for Win XP
Size: 20 MB
Download: stormng-20080805075914.zip

Intel Graphics Display VGA Driver For Win XP
Size: 19.18 MB
Download: display-20080805074803.zip

ATI Graphics Display VGA Driver For Win XP
Size: 141 MB
Download: Part1: ati_part1.rar Part2: ati_part2.rar (download boths parts and extract using winrar)

RICOH and O2Micro Card Reader Driver For Win XP
Size: 5774 KB
Download: card-reader.zip

Ethernet Realtek Lan Card Driver for Win XP
Size: 4433 KB
Download: lan-20080805080425.zip

Ethernet Marvell Lan Card Driver for Win XP
Size: 23.01 MB
Download: lan-20080911125222.zip

Modem Driver for Win XP
Size: 7.05 MB
Download: modem.zip

Realtek Audio driver for Win XP
Size: 45.6 MB
Download: sound-20080805080653.zip

Conexant Audio driver for Win XP
Size: 7.48 MB
Download: sound-20081014174616.zip

Synaptics Touchpad Driver for Win XP
Size: 33.80 MB
Download: tpdrv-20080911125649.zip

Chicony Webcam Camera driver For Win XP
Size: 21.9 MB
Download: webcam-20080911125721.zip

Intel Wireless WLan Driver for Win XP
Size: 4.04 MB
Download: WLAN-Intel-3495-4965-v1200730.zip

Atheros Wireless WLan Driver for Win XP
Size: 18.17 MB
Download: WLAN-Atheros-7611491.zip

Realtek Wireless WLan Driver for Win XP
Size: 9.69 MB
Download: WLAN-20080902152237-.zip

Fingerprint Reader Driver For Win XP
Size: 22.71 MB
Download: fp-sw-20080528154534.zip

BlueTooth Driver for Win XP
Size: 31 MB
Download: BT-stack.zip