This article was previously published under Q257199
When you are using a Windows 2000-based computer and the computer attempts to enter hibernate or standby, you may receive the following error message:
The device driver for the 'PC/AT Enhanced PS/2 Keyboard(101/102-Key)'device is preventing the machine from entering hibernation. Please close all applications and try again. If the problem persists, you may need to update this driver.
This behavior can occur if a program installs a kernel-mode driver that attaches itself to the standard keyboard driver (I8042prt.sys). Examples of programs that exhibit this behavior include:
Pgpdisk 6.02 and 6.5 (installs Pgpmemlock.sys and Pgpdisk.sys drivers)
Adobe Type Manager 4.0 (installs the Atmhelpr.sys driver)
To workaround this issue, uninstall the offending program and reboot the system.
To resolve the issue contact the manufacturer to inquire about obtaining an updated version of the product that is designed for Windows 2000.
The error message indicates that the program installed a kernel-mode driver that attaches itself to the keyboard driver and does not support Plug and Play I/O request packets (IRPs).
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.