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The information in this article applies to:

Microsoft Windows 98
Microsoft Windows 95
Microsoft Windows Millennium Edition
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SYMPTOMS
You may receive random general protection (GP) fault error messages in
Mmsystem.dll. You may also receive one of the following error messages:

Rundll32 - This program has performed an illegal operation and will be shut down.

Rundll - This program has performed an illegal operation and will be shut down.

Clicking the Details button reveals a message similar to one of the following:
RUNDLL32 caused a General Protection Fault in module MMSYSTEM.DLL

RUNDLL caused a General Protection Fault in module MMSYSTEM.DLL at
000a:00000032

This error message is more likely to occur after you use the Add New
Hardware tool in Control Panel.

CAUSE
This problem can occur if the "drivers=mmsystem.dll" line is missing from the
[boot] section of the System.ini file.

RESOLUTION
To correct this problem, follow these steps:
Use any text editor (such as Notepad) to edit the System.ini file.

Add the following line to the [boot] section of the file:
drivers=mmsystem.dll

Save and then close the System.ini file.

Restart your computer.

This problem can occur when the System.ini file has been replaced with the
System.cb file.