Hi,

A week ago, I had a problem with my laptop in which the explorer.exe was restarting itself, when I was trying to fix it, I ran the Sfc/scannow, and it turns out, there were some files broken, then, following the instructions here of how to replace the files manually, I get to the Command prompt, and used the command "takeown", but when continued to the "icacls" command, it shows the message:

"No mapping between account names and security IDs was done. Successfully processed 0 files; Failed processing 1 files."

I didn't understand what was that, and in the page didn't said anything about that message, I thought that the explorer.exe problem also corrupted this solution, in the end, turns out, it was a third party program which was incorrectly un-installed, I fixed and forget about the other problem, until today when I was trying to open Word, when it turns out, that Office was "installing", something that doesn't make sense as I already had it installed and worked on it in the past. But when it's close to the finish, it shows, Error 1920, and that I don't have the requeriment grants, later looking on the internet, there was this "solution" (since I couldn't test it, I don't know if it works) saying that I have to user the command "icacls", but any time that I try, it says "No mapping between accounts..." therefore, I couldn't solve it that way.

I don't know what exactly to do, since I don't understand exactly what I broke, hope you can help me, and thanks in advance.

Hi,

According to your description, the current problem is your Office program.

If I am right, there is no any other problem on your system. It narrows down to the Microsoft Office program issue.

Please run with safe mode to troubleshoot:
1.Click WIN+R;
2.Type Winword.exe /safe;
3.Press Enter.

If the issue would be gone in safe mode, it indicates the issue is caused by add-ons, please disable the add-ons one by one to clarify which one is culprit.

If the issue still persists, go Office forum for further help:

http://social.technet.microsoft.com/Forums/office/en-US/home?category=officeitpro

Meanwhile, I would like to suggest you use System Restore to roll back to a previous time when everything worked fine.

How to  refresh, reset, or restore your PC

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

If I misunderstanding, please correct me.