How can I set full permission to all folders on my computer? I have only one account administrator.
You do not want to do this, really.
But in the case you want to loose the security you can on choice:
But I do not advise to do this.
EDIT: edited link for windows 7
I had a similar situation (in my situation I wanted to be able to compare two test virtual machines), and I am describing here the process that worked for me.
We can change permissions recursively on drive c: (as described here), but one first have to take ownership of all files and folders by using the following command (on a command line "run as an administrator")
One then have to take explicitly ownership of the system folders such as windows, program files, program files (x86), ProgramData, and any other system file or folder that you want to change the permissions (you can determine which folder you have to take explicitly ownership, by seeing which folder windows denies to change permissions, or by right clicking the folder and trying manually to edit to permissions).
For example to change the ownership for the windows folder execute the following command
After having correctly the ownership, then changing the permissions recursive will work