I have found a way of installing Media Player 9 onto systems using the first edition of Windows 98.
Have installed a zip utility such as WinZip
http://www.winzip.com
Download Microsoft Media Player 9 for Windows 98SE/ME/2000
http://www.microsoft.com/windows/windowsmedia
Create a new folder on you desktop by right clicking on a blank area of the desktop and selecting, New, Folder
Name the new folder
wmp9
Right click on the downloaded file
MPSetup.exe
Select, WinZip, Extract To...
Choose the folder you created earlier by left clicking on it once
wmp9
you created earlier by left clicking on it once. Then click on the Extract button. Wait while the files are copied to the wmp9 folder. Then click on Windows Start button. Select Run. Type,
regedit
Double click on the following folders in the correct order;
HKEY_LOCAL_MACHINE
Software
Microsoft
Windows
CurrentVersion
In the right section in the Name column, double click on the following names and change their data value to:
ProductName Microsoft Windows 98 Second Edition
Version Windows 98SE
VersionNumber 4.10.2222
Hit OK after changing each value. Close Regedit.
Open the folder wmp9 and double click on wm_setup.exe to begin installation.
Follow the prompts to install Media Player 9 onto your system.