mmsystem004 error

I have a couple of thoughts. You might have either a sound conflict or a settings problem.

Sound Conflict:
This error means another program on your computer is already trying to play sounds. Two programs cannot play sounds simultaneously. Try closing all programs, then try to play again.

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Settings problem:
Go to:
- Start-Programs
- Programs
- Accessories
- System Tools
- System Information
- Tools
- System Configuration
- Checker
- System.ini-drivers

Unchecked the box for a windows file named wave=mmsystem.dll.

- Apply new setting.

As a stab:

1 Click Start, point to Settings, and then click Control Panel.
2 Double-click the Multimedia icon.
3 On the Advanced tab in Windows 95, or on the Devices tab in Windows 98, double-click Media Control Devices.
4 Click Wave Audio Device (Media Control), and then click Properties.
5 Click Use This Media Control Device, and then click OK.
6 Repeat steps 4-5 for MIDI Sequencer Device (Media Control) and Motion Video Device (Media Control), and then click OK.
7 Close Control Panel, and then restart Windows.

Or

1 Use any text editor (such as Notepad) to edit the System.ini file.
2 Add the following line to the [boot] section of the file:

drivers=mmsystem.dll

3 Save and then close the System.ini file.
4Restart your computer.