AxCrypt is accessed via the right-click context menu, under the heading ‘AxCrypt’. There is also a built-in encryption in some versions of Windows, which is accessed in a similar way, but under the heading ‘Properties’, then the button ‘Advanced’ and finally the check box ‘Encrypt contents to secure data’. This encryption uses a feature called Encrypting File System, or EFS for short.
There are typically two reasons for getting ‘Access Denied’ messages. Both occur when files are either moved to a new system, or Windows is (re)installed on an existing system. One situation is a problem, the other is not.
If the file names in Windows Explorer are shown in black text, then you’re likely just having an NTFS ownership issue, and this is easily remedied. Please Google for ‘ntfs take ownership’ (without the quotes) to find suggested solutions.
If the file names in Windows explorer are shown in green text, then you’ve inadvertently encrypted the file with EFS, and may have a bigger problem. Possibly your files are lost. Please Google for ‘efs access denied’ (without the quotes) for explanations and possible remedies.
EFS may in some cases be a useful feature, and can for some scenarios be a better solution than AxCrypt. However… Beware: There be Dragons!
Because of the way EFS is implemented, it is also likely to be the single most common cause of data loss in Windows-environments. If you’re a computer security wizard, and have a full understanding of X.509 encryption certificates, and how the Windows Certificate Stores work and interact with user credentials, then you won’t have a problem as long as you’re careful to ensure backups of the appropriate certificates and keys. If, however, the previous sentence confuses you then you should probably not be using EFS because of the mentioned risk of data loss when moving files to a new system, or (re)installing Windows, or resetting passwords, or…