Easy File Locker is a free program which lets you secure windows files and folders so that users will not be able to open, read, modify, delete, move or copy the locked folders and files with this application.
You can protect files and folders and apply various security levels like access, write, delete and visible individually on any file and folder you protect with this tool. It will keep on protecting hidden file and folders in safe mode also depending on the access rights you had specified.
It will not slow down your computer, as it is based on the NTFS file and folder permissions and work very well. By locking your files with this software you can sure that no one will never get a chance to destroy your data.