Problems When Exiting Windows or WFWG After Running 386 Enh

• Microsoft MS-DOS operating system versions 5.x, 6.x
• Microsoft Windows operating system versions 3.1, 3.11
• Microsoft Windows for Workgroups versions 3.1, 3.11

SYMPTOMS

When you quit Windows or Windows for Workgroups after running in 386 enhanced mode, the system stops responding (hangs).

CAUSE

This problem can occur when one or more of the following conditions exist:

• Your system does not properly support loading MS-DOS high (DOS=HIGH) in the CONFIG.SYS file.
• Your system is using an incorrect A20 handler for HIMEM.SYS.
• You are using a WINSTART.BAT file.
• Your system has a upper memory block (UMB) conflict.
• Your network interface card (NIC) is not correctly terminated.
• You are loading a network card driver (such as 3C509.COM) after running NET START (typically in your AUTOEXEC.BAT file).
• You have a corrupted .WAV file playing as the Windows exit sound.

STATUS

Microsoft has confirmed this to be a problem in Windows versions 3.1 and 3.11 and Windows for Workgroups versions 3.1 and 3.11. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

WORKAROUND

To work around this problem:

• Remove DOS=HIGH from your CONFIG.SYS file and restart the system.
• Try using a different A20 handler. For more information about A20 handlers, see your MS-DOS "User's Guide."
• Discontinue using a WINSTART.BAT file to load memory-resident programs; load them from your AUTOEXEC.BAT file instead.
• Run MemMaker or perform other step to resolve any potential UMB conflicts. For more information on UMB conflicts, query on the following words in the Microsoft Knowledge Base:

        umb and ms-dos and conflict and emm386.exe and tshoot
  

• Disassociate the Windows Exit sound from the corrupted .WAV file. Do this by selecting the Sound icon from the Control Panel window, in the Events box, choose Windows Exit, from the Files box, choose <none>, choose the OK button. The .WAV file should no longer be associated.

MORE INFORMATION

For more information about WINSTART.BAT, refer to your Microsoft Windows or Windows for Workgroups "User's Guide."