In Windows 7 or Vista the Windows Media Player has a system file named mfpmp.exe. The file is Present in C:\Windows\System32. But sometimes this file creates a lot of problem like taking lot of resources, not playing the subtitles etc. So most of us consider to delete it. But we need to take ownership of the file in order to get rid of mfpmp.exe. Otherwise it shows the error message below.

Just follow these simple steps and you will get rid of mfpmp.exe in no time.
Step 1: Open command prompt (Press Start+R, Type cmd and Enter).

Step 2: In command prompt, type:
takeown /f C:\Windows\System32\mfpmp.exe
and press Enter

Step 3: Again in command prompt, type:
icacls C:\Windows\System32\mfpmp.exe /grant (user name):F
and press Enter.
For example, icacls C:\Windows\System32\mfpmp.exe /grant DENNIS:F

Step 4: You should be able to delete the file mfpmp.exe now. If you still can't, you may need to reboot and try again. Try Renaming the file to anything else then mfpmp.exe as shown below if you dont want to delete it.

N.B.:
1. You Can delete the mfpmp.exe file. But i renamed it if in case you need it in future.
2. This technique for taking ownership can be used for any file.