From: Computerpilot on 07/08/2002
Follow these instructions to repair the damaged file (you may need to get someone that knows computers to help you with this one):
1)Click Start , and then click Run .
2)In the Open box, type Msconfig , and then click OK .
3)In System Configuration Utility, click Extract File on the General tab.
4)In the Extract one file from installation disk dialog box, type Winmm.dll , and then click Start .
5)In the Restore from box, type drive :\win9x (where drive is the drive that contains your Windows Millennium Edition CD).
NOTE : If you have an original equipment manufacturer (OEM) installation of Windows, the installation files may also be located in one of the following folders
where drive is the drive on which Windows is installed. For example, type C:\Windows\Options\Install .
6)In the Save file in box, type drive :\Windows\System (where drive is the drive on which Windows is installed), and then click OK .
7)In the Backup File dialog box, record the location of the backup folder, and then click OK .
8)If the The backup folder does not exist. Do you want to create it? message appears, click Yes .
The Winmm.dll file is extracted.
9)In System Configuration Utility, click OK , and then click Yes to restart your computer.
If this does not work, post back and I will help you out with another solution. I am pretty sure this should get rid of your error message.