1. Disconnect any portable music or video devices that might be attached to your computer.
For more information, see Issues with devices after removing Windows Media Player.
2. In Category View of Control Panel, click Add or Remove Programs, and then click Remove a program.
3. At the top of the list, select the Show updates check box.
4. In the Windows XP - Software Updates section, click Windows Media Player 11, and then click Change/Remove.
5. In each of the two confirmation dialog boxes that appear, click OK.
6. When the rollback process is complete (it might take several minutes to complete), click Restart.
7. In Category View of Control Panel, click Add or Remove Programs, and then click Remove a program.
8. At the top of the list, select the Show updates check box.
9. In the Windows XP - Software Updates section, click Windows Media Format 11 Runtime, and then click Change/Remove.
If you installed a non-US English version of Windows Media Player 11, the instructions in the dialog boxes that are mentioned in steps 9, 10, and 11 might appear in English.
10. In the first confirmation dialog box that appears, click OK.
11. In the second confirmation dialog box that appears, select the Do you want to continue with the rollback? check box, and then click OK.
12. When the rollback process is complete (it might take several minutes to complete), click Restart.
13. In Category View of Control Panel, click Add or Remove Programs, and then click Remove a program.
14. Click Microsoft User-Mode Driver Frameworks Feature Pack 1.0, and then click Remove.
15. Follow the instructions that appear in the Software Update Removal Wizard.
If the Wudf01000 confirmation dialog box appears, click Yes to continue. When the software removal process is complete (it might take several minutes to complete), click Finish.
-> Cách remove WMP 11, có gì ko hiểu thì bạn thắc mắc đi