Article ID: 256233
Article Last Modified on 2/28/2007
APPLIES TO
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional Edition
This article was previously published under Q256233
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
SYMPTOMS
After you upgrade a Microsoft Windows NT 4.0-based computer to Windows 2000, the mouse and keyboard may become non-functional if you reinstall the Logitech 9.0 mouse drivers and reboot the computer. This usually occurs only if the Logitech 9.0 Mouseware drivers were installed on Windows NT 4.0 before the upgrade to Windows 2000.
NOTE: Booting the system into Safe mode or using the "Last known good configuration" option does not restore the mouse or keyboard functionality.
CAUSE
The Logitech installer adds filter drivers to enhance mouse and keyboard functionality. The problem because the installer program adds "Lkbdflt2" and "Lmouflt2" entries to the following registry locations:
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318}:
UpperFilters:REG_MULTI_SZ: Lkbdflt2 kbdclass
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E96F-E325-11CE-BFC1-08002BE10318}:
UpperFilters:REG_MULTI_SZ: Lmouflt2 mouclass
These entries require associated entries in the HKLM\System\services key to be added to work properly, but these entries are missing.
RESOLUTION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To remove the "Lkbdflt2 and Lmouflt2" filter driver entries, use one of the following methods.
Method 1: Connected to a Network
If the computer is connected to a network, you can remotely edit the registry as follows.
NOTE: If the computer is networked but not part of a domain, you may need to map a connection to the computer's IPC$ share by using that computer's local administrator credentials before you can attach with Regedt32.exe as described below. To map a connection to the computer's IPC$ share, use the following command:
net use \\remote_computer_name\IPC$ /user:administrator *
- From another Microsoft Windows NT-based or Windows 2000-based computer on the same network, run Regedt32.exe.
- On the Registry menu, click Select Computer, and then type the computer name of the computer that has no keyboard or mouse.
- After you connect, click Hkey_Local_Machine on
Remote_Computer_Nameon the Window menu, and then navigate to the following key:SYSTEM\CurrentControlSet\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318}
- Double-click the UpperFilters:REG_MULTI_SZ: Lkbdflt2 kbdclass value, and then remove only the Lkbdflt2 entry.
- Navigate to the following registry location:
SYSTEM\CurrentControlSet\Control\Class\{4D36E96F-E325-11CE-BFC1-08002BE10318}
- Double-click the UpperFilters:REG_MULTI_SZ: Lmouflt2 mouclass value, and then remove only the Lmouflt2 entry.
- On the Registry menu, click Close.
- On the Registry menu, click Exit.
- Restart the computer with the mouse/keyboard problems. After the computer restarts, the mouse and keyboard should be functional.
Method 2: Not Connected to a Network
If the computer is a stand-alone computer with no networking installed:
- Boot the computer from the Windows 2000 CD-ROM or Setup disks, and then start Recovery Console.
- Change to the %SystemRoot%\System32\Config folder, and then rename the System file to System.bad.
- Change to the %SystemRoot%\Repair folder, then copy the System file to the %SystemRoot%\System32\Config folder.
- Quit Recovery Console (type exit). The computer restarts. This should return the keyboard and mouse to a functional state. Note however, that any new devices or services that have been installed since the initial installation will be missing. To restore these services or devices to functionality, continue with these steps.
- Log on to the computer, and then start Registry Editor (Regedt32.exe).
- On the Registry menu, click Load Hive, navigate to the %SystemRoot%\System32\Config folder, and then double-click the System.bad file. When you are prompted for a key name, type Test.
- Double-click the Test key to expand it, and then click the Select key. Note the value for the Default value:
Default:REG_DWORD:0x1 (This number represents a ControlSet
XXXnumber.) - Navigate to the following registry key based on the ControlSet number you noted:
TEST\ControlSet
XXX\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318} - Double-click the UpperFilters:REG_MULTI_SZ: Lkbdflt2 kbdclass value, and then remove only the Lkbdflt2 entry.
- Navigate to the following registry location:
TEST\ControlSet
XXX\Control\Class\{4D36E96F-E325-11CE-BFC1-08002BE10318} - Double-click the UpperFilters:REG_MULTI_SZ: Lmouflt2 mouclass value, and then remove only the Lmouflt2 entry.
- Double-click the Test key to collapse the entry, and then click Unload Hive on the Registry menu.
- Quit Registry Editor.
- Reboot the computer by using the Windows 2000 CD-ROM or Setup disks again, and then start Recovery Console.
- Change to the %SystemRoot%\System32\Config folder, and then rename the System file to System.good.
- Rename the System.bad file to System (with no extension).
- Quit Recovery Console (type exit). The computer restarts. This should return the keyboard and mouse to a functional state. Note that all previous services and devices are present and operational again.
MORE INFORMATION
Contact Logitech Technical Support for information about Windows 2000-compatible Mouseware drivers.
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
255151 Lost Mouse and Keyboard after Installing Logitech V8.x Mouseware
Keywords: kb3rdparty kbenv kbhardware kbprb KB256233
