To disable the tablet functionality on Windows XP Tablet Edition 2005, do the following:
1) Go to Regional and Language Options in the Control Panel
2) Click the Languages tab
3) Click the Details button
4) Click the Advanced tab
5) Check Turn off advanced text services in the System Configuration section
6) Click OK as necessary
Furthermore, to disable the tablet input panel button in the taskbar, run regsvr32 /u "C:\Program Files\Common Files\Microsoft Shared\Ink\tipband.dll" and reboot. To regain the taskbar button, run regsvr32 "C:\Program Files\Common Files\Microsoft Shared\Ink\tipband.dll"
Update: To remove the login keyboard
