If your computer is running Microsoft Windows XP Service Pack 1 (SP1) and if you install a driver from read-only media (for example, from a CD-ROM), the driver files are marked as read-only. If you later select Last Known Good Configuration from the Windows Advanced Options menu when you start your computer, the digital signatures for the drivers are removed. The Device Manager then indicates that the driver is unsigned.
This problem occurs because the read-only driver files are also stored in the Windows\Lastgood.tmp folder, and zero-length OEMx.inf files are left in the Windows\Lastgood.temp\Inf folder. If these driver files and OEMx.inf files are deleted before you run Last Known Good Configuration, the problem does not occur.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest Windows XP service pack
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note
If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone
tab in the Date and Time tool in Control Panel.
Date Time Version Size File name -------------------------------------------------------------- 21-Mar-2003 23:56 126.96.36.199 24,576 Xpsp1hfm.exe 13-Dec-2002 01:08 5.1.2600.108 1,848,320 Ntkrnlmp.exe 13-Dec-2002 01:09 5.1.2600.108 1,902,080 Ntkrnlpa.exe 13-Dec-2002 01:09 5.1.2600.108 1,874,944 Ntkrpamp.exe 13-Dec-2002 01:08 5.1.2600.108 1,879,936 Ntoskrnl.exe 15-Nov-2002 22:05 5.1.2600.106 99,840 Services.exe 25-Mar-2003 18:05 5.1.2600.1190 1,895,936 Ntkrnlmp.exe 25-Mar-2003 18:05 5.1.2600.1190 1,951,744 Ntkrnlpa.exe 25-Mar-2003 18:05 5.1.2600.1190 1,923,584 Ntkrpamp.exe 25-Mar-2003 18:05 5.1.2600.1190 1,927,936 Ntoskrnl.exe 18-Dec-2002 02:20 5.1.2600.1152 99,840 Services.exe
Windows XP 64-Bit Edition
Date Time Version Size File name ----------------------------------------------------------------- 21-Mar-2003 23:55 188.8.131.52 59,904 Xpsp1hfm.exe IA-64 13-Dec-2002 01:09 5.1.2600.108 5,734,400 Ntkrnlmp.exe IA-64 13-Dec-2002 01:09 5.1.2600.108 5,677,568 Ntoskrnl.exe IA-64 15-Nov-2002 22:07 5.1.2600.106 330,240 Services.exe IA-64 25-Mar-2003 18:05 5.1.2600.1190 5,827,584 Ntkrnlmp.exe IA-64 25-Mar-2003 18:05 5.1.2600.1190 5,737,856 Ntoskrnl.exe IA-64 18-Dec-2002 03:23 5.1.2600.1152 330,240 Services.exe IA-64
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.