Panasonic Toughbook CF-31GT2AX2M Reference Manual page 123

Troubleshooting (Advanced)
Others
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Windows XP: [start]
Press Ctrl + Shift + Esc to open Task Manager and close the software
application.
An input screen (e.g., password input screen at startup) may be hidden behind
another window. Use Alt + Tab to check.
Shut down by sliding and holding the power switch for 4 seconds or longer, and
turn on the computer and open the application again. If Windows runs correctly,
but the application software does not start, click
[Uninstall a program] and remove the failing application software, then reinstall
the application software.
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(Start) - [Control Panel] -