Article ID: 939720
Article Last Modified on 7/31/2007
APPLIES TO
- Windows Vista Home Basic 64-bit Edition
- Windows Vista Home Premium 64-bit Edition
- Windows Vista Business 64-bit Edition
- Windows Vista Enterprise 64-bit Edition
- Windows Vista Ultimate 64-bit Edition
- Windows Vista Starter
- Windows Vista Home Basic
- Windows Vista Home Premium
- Windows Vista Business
- Windows Vista Enterprise
- Windows Vista Ultimate
SYMPTOMS
When you start a Windows Vista-based computer, you may receive a "Stop 0x50" error message that resembles the following:
This problem typically occurs very early in the startup process. For example, the problem may occur shortly after the splash screen appears, and you see a black screen with a moving progress bar. Specifically, this problem typically occurs when the system tries to load the i8042prt.sys driver. The problem only occurs in certain hardware configurations.
RESOLUTION
Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.
To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Prerequisites
No prerequisites are required.
Restart requirement
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
File information
The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.
Windows Vista, x86-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Ntkrnlpa.exe | 6.0.6000.16514 | 3,504,824 | 28-Jun-2007 | 02:30 | Not Applicable |
| Ntoskrnl.exe | 6.0.6000.16514 | 3,470,008 | 28-Jun-2007 | 02:30 | Not Applicable |
| Update-bf.mum | Not Applicable | 1,955 | 28-Jun-2007 | 14:20 | Not Applicable |
| Update.mum | Not Applicable | 2,669 | 28-Jun-2007 | 14:16 | Not Applicable |
| X86_b50c5078affe50966d4981c1c682bbfa_31bf3856ad364e35_6.0.6000.16514_none_4e65de02ad0fd904.manifest | Not Applicable | 697 | 28-Jun-2007 | 14:16 | Not Applicable |
| X86_cdd55a70af2e5c6188a8d6bc131b13de_31bf3856ad364e35_6.0.6000.20629_none_18c931a33e1e8c66.manifest | Not Applicable | 697 | 28-Jun-2007 | 14:16 | Not Applicable |
| X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6000.16514_none_6a435250b701059d.manifest | Not Applicable | 18,778 | 28-Jun-2007 | 14:20 | Not Applicable |
| X86_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6000.20629_none_6ac720a1d022400b.manifest | Not Applicable | 18,778 | 28-Jun-2007 | 14:20 | Not Applicable |
| Ntkrnlpa.exe | 6.0.6000.20629 | 3,504,824 | 28-Jun-2007 | 02:29 | Not Applicable |
| Ntoskrnl.exe | 6.0.6000.20629 | 3,470,520 | 28-Jun-2007 | 02:29 | Not Applicable |
Windows Vista, 64-bit versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Amd64_0d92ac3011d1888ec4bc56a90c58a339_31bf3856ad364e35_6.0.6000.20629_none_07e3372044c7a02f.manifest | Not Applicable | 701 | 28-Jun-2007 | 14:16 | Not Applicable |
| Amd64_f290731b74e984b19bee0314aaf93bb7_31bf3856ad364e35_6.0.6000.16514_none_8a7cd3df0528f018.manifest | Not Applicable | 701 | 28-Jun-2007 | 14:16 | Not Applicable |
| Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6000.16514_none_c661edd46f5e76d3.manifest | Not Applicable | 17,330 | 28-Jun-2007 | 14:24 | Not Applicable |
| Amd64_microsoft-windows-os-kernel_31bf3856ad364e35_6.0.6000.20629_none_c6e5bc25887fb141.manifest | Not Applicable | 17,330 | 28-Jun-2007 | 14:24 | Not Applicable |
| Ntoskrnl.exe | 6.0.6000.20629 | 4,431,544 | 28-Jun-2007 | 03:34 | x64 |
| Update-bf.mum | Not Applicable | 1,955 | 28-Jun-2007 | 14:20 | Not Applicable |
| Update.mum | Not Applicable | 2,669 | 28-Jun-2007 | 14:16 | Not Applicable |
| Ntoskrnl.exe | 6.0.6000.16514 | 4,430,008 | 28-Jun-2007 | 03:36 | x64 |
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Additional query words: STOP BugCheck Bug Check BSOD hang freeze NMI bluescreen blue screen
Keywords: kberrmsg kbbug kbfix kbqfe kbprb kbexpertisebeginner kbhotfixserver kbwinvistapostrtmfix KB939720
