hii..
The main CAUSE most prob is an incorrect version of the Wmpui.dll file is registered on your computer. This may occur when you install some third-party programs.
do this step...
RESOLUTION
To resolve this issue, register the correct Wmpui.dll file again: 1. Click Start, and then click Run.
2. In the Open box, type the following command, and then click OK:
regsvr32 %SystemRoot%\system32\wmpui.dll
You receive a message that is similar to:
DllRegisterServer in C:\WINNT\system32\wmpui.dll succeeded.
3. Click OK, and then start Windows Media Player again.
mostly (95%) will solve your problem.....
or download this dll application file from here and install the above folder... it will ask to replace click ..ok
http://www.dlldump.com/download-dll-files_new.php/dllfiles/W/wmpui.dll/9.00.00.3250/download.html
all the best...
reply if success..
luv
SK