Article ID: 283063 - View products that this article applies to.
This article was previously published under Q283063
When you are using a Windows 2000-based computer, a serial device may be detected as a serial mouse.
This problem can occur because most of the devices that are detected as serial mice that are some other type of device constantly send data to the serial port which causes the detection code to incorrectly identify the device as a serial mouse.
To resolve this problem, obtain the latest service pack for Windows 2000 and then update the registry as instructed below. For additional information about the latest service pack for Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:
260910The English-language version of this fix should have the following file attributes or later:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
Date Time Version Size File name ------------------------------------------------------ 1/17/2001 03:48p 5.0.2195.3156 13,936 Serenum.sys
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
After you apply the hotfix or the service pack, follow these steps:
To work around this problem, allow the device to be detected incorrectly, use Device Manager to disable the device that is not the port to which the device is attached, and then reboot your computer. When you do this, the port works correctly and the incorrectly detected device is disabled.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3. After you install Windows 2000 Service Pack 3, you must edit the registry as described in the "Resolution" section of this article.
Note that Microsoft Windows XP also includes the fixed Serenum.sys file; you must edit the registry as described in the "Resolution" section for Windows XP also.
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
265173For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/265173/EN-US/ )The Datacenter Program and Windows 2000 Datacenter Server Product
296861Applications may fail to initialize the GPS device once the SkipEnumerations change has been added to the registry even though the GPS is no longer being detected as a Serial mouse. This can be related to Ghosted serial devices still loading. For additional information about how to locate and uninstall Ghosted devices from mice and other pointing devices, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/296861/EN-US/ )Use QChain.exe to Install Multiple Hotfixes with One Reboot
(http://support.microsoft.com/kb/241257/EN-US/ )Device Manager Does Not Display Devices Not Currently Present
Motherboard based COM PortsFirst, you need to determine which HAL is being used before you can make the registry change. To determine which HAL is running on the system open Device Manager and expand Computer.
If the system has an ACPI HAL you can add the SkipEnumerations Reg_DWORD Value shown in Step 3 above to the serial port of choice located under
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ACPI\PNP0501\Port#\Device ParametersIf the system has a Standard (Non-ACPI HAL) you can add the SkipEnumerations Reg_DWORD Value shown in Step 3 above to the serial port of choice located under
NOTE: Port# = InstanceID
COM Ports on Serial Port Add-On CardsDiscovering the correct location in the registry for the port is more involved. Below is a method that will help to you locate and identify each component.
(http://support.microsoft.com/kb/249149/EN-US/ )Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
Article ID: 283063 - Last Review: February 21, 2007 - Revision: 3.4