WIN 7 (green file) Encrypted file not opening, cannot copy

HI,

There was this laptop of my client which was having OS Issues, So I reinstalled Win 7 on C: Drive and did not touch other two drives. The issue is that some of the file are green in color and these are the files which cannot open.
Error:  Access Denied, You need Administrator Privilege, the new user is Administrator.

I searched online and tried to take ownership by going to --Properties--Security--Permission. No success, Please help me out.

Thanks in Advance

PS: old OS also was WIN 7

Encrypted file or folder name is shown in green color. Not having a backed-up recovery key can result in irrevocable loss of encrypted data. Backing up a recovery key helps ensure that encrypted data can be recovered in the event that the user holding the EFS encryption certificate is not able to decrypt the data.

"Advanced EFS Data Recovery"
https://www.elcomsoft.com/aefsdr.html