Can't copy any files to Local Disk (Drive:C). For Some unknown reason I lost lost my ownership to a system when I checked the advance security settings and asking about CLSID key and I don't know which administrator is the one I should select in the settings

Have you chance to run a System Restore process to get your computer back its previous state?

http://windows.microsoft.com/en-us/windows-8/restore-refresh-reset-pc

Hi,

In addition to T.Kujala mentioned , please let us know what files you want to copy to your System Partition.

Did any error appear when the issue occurred?

Under ordinary conditions, the ownership of System Partition(Driver:C) is TrustedInstaller.

I suggest you add your account to "Group or user name " to test it.

1.   Right click on Drive C and click Properties.

2.   Switch to Security tab, click Edit and Add to add your user account, if it is not listed. Assign the full control permission for your own account and click OK.

Also,I would like to share the article below with you:

http://technet.microsoft.com/en-us/library/cc754344.aspx

Regards,