Hi,
You may be able to find help here
it sounds like there may be some corrupt files. Installer cleanup might fix that. Then try installing Zune apps again.
http://support.microsoft.com/default.aspx/kb/290301
Diana , MSP, MSBP, .Net Developement and Visual Studio Forums Moderator, MSDN Sandbox Forums Moderator http://djartsinc.spaces.live.com Smile,,,Share Some Sunshine