There is a way to lock your private folder just with dos command. No need to buy expensive software to protect your private data. Below is the example:

Let say you want to lock c:\private data

Just rename by the following DOS command:

ren c:\private data private data.{21EC2020-3AEA-1069-A2DD-08002B30309D}

Any attempt to open this folder will send the visitor to control panel.

To unlock the directory just run the next DOS command:

ren c:\private data.{21EC2020-3AEA-1069-A2DD-08002B30309D} private data

You can protect your directories this way without having to pay for some directory protection software.