>Nowadays security things are in increasing progress.
>how can i make a very high secure protection for a specific folder on disc(hard disc or even on USB)
>-want to access to this folder (and its subfolders) by username+password (as administrator only) maybe also by voice recognition if possible.
>- folder visible in explorer cannot be copied ,deleted or moved or renamed.
>-a vfp code is believed to set this folder and work with (access programmatly to data..update data..).
>-what level of protection methods can give (i hope 100%) ?

If it's OK to encrypt an entire drive (e.g. USB), one option might be BitLocker To Go.

Probably the most common use is to store the credentials on the computer that applied BitLocker to the USB device, so that when the USB is connected to that computer it is automatically unlocked. But, that option can be turned off so a key is required.

There are other products that do similar things and can encrypt just folders instead of entire drives e.g. TrueCrypt https://en.wikipedia.org/wiki/TrueCrypt