Win8 how to delete an unknown account (s-1-5-21-2000478354-1390067357-725345543-1003)

Win8 how to delete an unknown account (s-1-5-21-2000478354-1390067357-725345543-1003)
Today, we suddenly found that the compressed game files copied elsewhere cannot be decompressed. In the past, we put all the game files under this directory. In the past, when we started playing games on a LAN, we could not always be a host, and can not download the RPG map to play the LAN, previously paid attention to this unknown account (s-1-5-21-2000478354-1390067357-725345543-1003), think it is the problem, but has not been put to solve, today is a little angry, you must have deleted this unknown account !! Then I started searching the Internet .. This is a problem left over by the system account. You can delete it and try Method 1: select a partition first, right-click, choose security, select Advanced, select the owner tag, select edit, and select the Administrator group (administrators), tick the following, and click Apply. After the preceding steps, the owner of all files becomes the administrator.
Step 2: select the partition again, right-click the partition, select Security, select the Advanced button, select the permission tag, and click the change permission button below to check the bottom of the list, click application! But there is no owner option in win8 !! What makes me feel! You can only find the method by yourself. I didn't expect that the unknown account would disappear: Right-click, choose Properties, choose security, edit, and select an account to completely control, modify, read, and execute the account... -- Application -- OK, the account should disappear, and other functions will work properly !!!!