Shows that incompatible for Windows

Hi
I use windows media player version 11 on my PC. I have installed Mappoint 2004 without any troubles and the program runs very well. But without uninstalling Mappoint 2004, I try to install 2006. In the mid time of the install process an error message occurs that seems like this

Windows Media Player 10
Windows Media Player 10 This version of Windows Media Technologies is incompatible with this version of Windows. For more information, view the information at the Microsoft web site. |
Need to solve this error. Thanks.
