Microsoft KB Archive/131582

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ThinkPad with PCMCIA Adapter Hangs in Protected Mode

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Q131582

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The information in this article applies to:


 * Microsoft Windows 95

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SYMPTOMS
After you boot to a real-mode MS-DOS command prompt and install Windows 95 over an existing Windows 95 installation on an IBM ThinkPad computer, the computer stops responding (hangs) when you try to start Windows 95. This problem occurs only if you install Windows 95 from a network server and you are using a PCMCIA network adapter to access the network.

CAUSE
Accessing the network with a PCMCIA network adapter after booting to a MS- DOS command prompt will require real mode Card and Socket service drivers. When installing Windows95 over a previous installation, it will preserve the existing driver configuration.

If the previous installation of Windows95 includes 32 bit PCMCIA card and socket services, and the computer is currently running real mode card and socket services, The setup program may hang during 1st boot due to a conflict between the real mode and 32 bit Card and Socket Services.

RESOLUTION
To prevent this problem from occurring, use either of the following methods:


 * Run Windows 95 Setup from the graphical user interface (GUI) rather than from a real-mode MS-DOS command prompt.
 * Disable protected-mode PCMCIA support before installing Windows 95. To do so, follow these steps:


 * Use the right mouse button to click My Computer, then click Properties on the menu that appears.
 * Click the Device Manager tab.
 * Click the PCMCIA socket, then click Properties. Note that you may need to expand a branch of the hardware tree by double-clicking the branch, or by clicking the plus sign (+) to the left of the branch, before you can click the PCMCIA socket.
 * Click the Original Configuration (Current) check box to clear it.
 * Click OK.

If you have already installed Windows 95 over an existing Windows 95 installation, use either of the following methods to resolve the problem:


 * Boot to an MS-DOS command prompt and disable the real-mode drivers for the PCMCIA socket and network adapter. To do so, follow these steps:


 * Restart the computer. When you see the "Starting Windows 95" message, press the F8 key. Then, choose Command Prompt Only from the Startup menu.
 * Remove all real-mode drivers and memory-resident programs for the PCMCIA socket and network adapter from the CONFIG.SYS and AUTOEXEC.BAT files.
 * Restart the computer normally.
 * Start Windows 95 in Safe mode, and then disable protected-mode PCMCIA support in Device Manager. To do so, follow these steps:


 * Restart the computer. When you see the "Starting Windows 95" message, press the F5 key.
 * Use the right mouse button to click My Computer, then click Properties on the menu that appears.
 * Click the Device Manager tab.
 * Click the PCMCIA socket, then click Properties. Note that you may need to expand a branch of the hardware tree by double-clicking the branch, or by clicking the plus sign (+) to the left of the branch, before you can click the PCMCIA socket.
 * Click the Original Configuration (Current) check box to clear it.
 * Click OK.

STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows 95. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords : win95

Issue type :

Technology : kbWin95search kbWin95