After install the third party software, I got problems, the Windows Media Player stop responding. Here is to fix, got this from Microsoft website.
Windows Media Player stops responding after you install a third-party product that registers its own version of the Wmp.dll file
View products that this article applies to.
Support for Windows Vista without any service packs installed will end on April 13, 2010. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). For more information, refer to this Microsoft web page: Support is ending for some versions of Windows (http://windows.microsoft.com/en-us/windows/help/end-support-windows-xp-sp2-windows-vista-without-service-packs)
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 (http://support.microsoft.com/kb/322756/ ) How to back up and restore the registry in Windows
To resolve this issue yourself, follow these steps:
1. Log on as an administrator.
2. Click Start, type cmd in the Start Search text box, right-click cmd.exe, click Run as administrator, and then click Continue.
3. At the command prompt, type regsvr32 wmp.dll, and then click OK.
4. Start Notepad.
5. Paste the following text into Notepad:
REGEDIT4
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA71-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WMZ"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA72-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.AIFF"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA73-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.AU"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA74-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.MIDI"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA76-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.MP3"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA77-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.MP3"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA78-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.M3U"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA7B-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WAV"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA83-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WAX"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA84-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WMA"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA88-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.AVI"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA89-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.MPEG"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA8F-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.ASX"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA90-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.ASX"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA92-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.ASF"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA93-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.ASX"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA94-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WMV"
[HKEY_CLASSES_ROOT\CLSID\{CD3AFA95-B84F-48F0-9393-7EDC34128127}\ProgID]
@="WMP11.AssocFile.WVX"
[HKEY_CLASSES_ROOT\CLSID\{EE4DA6A4-8C52-4a63-BBB8-97C93D7E1B6C}\ProgID]
@="WMP11.AssocFile.WMD"
6. Save the file as VistaWMPFix.reg.
7. Start Registry Editor.
8. Click File, and then click Import.
9. Select the VistaWMPFix.reg file that you created in step 6, and then click OK.
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or you can use Fix it for me.