Article ID: 192841
Article Last Modified on 5/28/2007
APPLIES TO
- Microsoft Windows 95
- Microsoft Windows 95
- Microsoft Windows 95
- Microsoft Windows 95
This article was previously published under Q192841
SYMPTOMS
When you start your Windows 95-based or Windows 95 OEM
Service Release- based computer that is using an AMD K6/2 (350MHz or faster),
or an AMD Athlon (1.1GHz or faster), you may receive one of the following error
messages:
- Device IOS failed to initialize. Windows Protection Error.
You must reboot your computer.
- Windows Protection Error. You must reboot your computer.
- While initializing device IOS: Windows protection
error.
NOTE: This problem is very intermittent on the K6/2 at 350 MHz, but
occurs more often at higher speeds. This problem can also occur when you start
your computer in Safe mode.
CAUSE
The first error message is a result of a divide exception
in Ios.vxd; the second is due to a similar error within Esdi_506.pdr or
Scsiport.pdr.
The original released versions of the files listed in
the "Resolution" section of this article contain initialization timing loops
that do not execute properly on the indicated processors at speeds of 350 MHz
and faster. Note that this problem is due to limitations of the software
algorithms, and is not indicative of a problem with the processor itself, which
is functioning properly.
RESOLUTION
The AMD-K6-2 update has been revised to incorporate a newer
version of Vfbackup.vxd file. For information about this update, please see the
following article in the Microsoft Knowledge Base:
234259 Revision To AMD K6-2/350 Central Processing Unit Update
A supported fix that corrects this problem for Microsoft Windows
95 OEM Service Release versions 2, 2.1, and 2.5 is now available from
Microsoft, but has not been fully regression tested and should be applied only
to computers experiencing this specific problem. If you are not severely
affected by this specific problem, Microsoft recommends that you use the next
release of Windows.
Scroll down to the Service Packs section and then click the link
to download the Windows 95 Update for AMD-K6-2/350.
This issue is
resolved by the following updated files for Windows 95 OSR 2 and OSR 2.1:
Date Time Version Size File name
---------------------------------------------------------
09/04/98 11:18am 4.00.1118 24,426 bytes Esdi_506.pdr
08/03/98 11:13am 4.00.1113 25,249 bytes Hsflop.pdr
09/04/98 11:12am 4.00.1112 23,158 bytes Scsiport.pdr
01/15/97 11:12am 4.00.1112 59,153 bytes Cdfs.vxd
01/15/97 11:12am 4.00.1112 18,809 bytes Disktsd.vxd
01/15/97 11:12am 4.00.1112 9,955 bytes Int13.vxd
09/04/98 11:13am 4.00.1113 68,962 bytes Ios.vxd
01/15/97 11:12am 4.00.1112 18,197 bytes Vfbackup.vxd
In addition, the following updated file is needed for OSR 2.1:
Date Time Version Size File name
--------------------------------------------------------
12/04/98 12:13pm 4.00.1213 111,678 bytes Ntkern.vxd
NOTE: This fix does not correct the problem for the retail version of
Windows 95. In addition, versions of the Amdk6upd.exe update dated "09/18/98
11:00am" do not replace the Ntkern.vxd file in OSR 2.1 and OSR 2.5. To
determine the version of the Ntkern.vxd file installed on your computer,
right-click the Ntkern.vxd file in the Windows\System\Vmm32 folder, click
Properties, and then click the Version tab. If the version number is not
4.03.1213, you should obtain and install a new version of the update, as
described below. Note that the version of the original Ntkern.vxd file is
4.03.1212.
To install this update, follow these steps:
- Download the Amdk6upd.exe file to a floppy disk. Download
the file from another computer, if necessary.
- Restart your computer. When you see the "Starting Windows
95" message, press the F8 key, and then choose Safe Mode from the Startup menu.
- If your computer starts in Safe mode, skip to step 6. If
you cannot start Windows, continue with step 4.
- Restart your computer. When you see the "Starting Windows
95" message, press the F8 key, and then choose Command Prompt Only from the
Startup menu.
- At the c:\ prompt, type win /d:m to
start Windows in Safe mode.
- Insert the floppy disk containing the Amdk6upd.exe file you
downloaded in step 1, and then use Windows Explorer or My Computer to
double-click the file.
- Follow the instructions on the screen to install the
update.
The
following file is available for download from the Microsoft Download
Center:
For additional information about how to download Microsoft Support files, click
the following article number to view the article in the Microsoft Knowledge
Base:
119591 How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most
current virus-detection software that was available on the date that the file
was posted. The file is stored on security-enhanced servers that help to
prevent any unauthorized changes to the file.
STATUS
Microsoft has confirmed this to be a problem in Microsoft
Windows 95 and OEM Service Release versions 2, 2.1, and 2.5.
This
issue is resolved in Microsoft Windows 98.
Additional query words: amd K6 350 IOS
Keywords: kbhotfixserver kbqfe kbdownload kbenv kberrmsg kbfile kbgraphxlinkcritical kbprb KB192841