You can download driver for HP tr3000 Rugged Tablet PC from this page:

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=405981&prodTypeId=321957&prodSeriesId=405979&swLang=13&taskId=135&swEnvOID=1059

BIOS
ROMPaq for HP Rugged Tablet PC System BIOS – DOS Bootable Diskette

Driver - Graphics
Intel Extreme Graphics Driver for Windows XP Tablet PC Edition

Driver - Keyboard, Mouse and Input Devices
Rotate Button Driver for Windows XP Tablet PC Edition

Driver - Modem
Smartlink Modem Driver for Windows XP Tablet PC Edition

Driver - Network
Airvast Wireless LAN Driver for Windows XP Tablet PC Edition
Billionton Bluetooth Driver for Windows XP Tablet PC Edition
Cisco Aironet Wireless LAN Drivers Download Link
Sierra Wireless Aircard 550 Drivers
Sierra Wireless Aircard 555 Drivers
Sierra Wireless Aircard 750 (AT&T) Drivers
Sierra Wireless Aircard 750 (T-Mobile) Drivers