You can use the SanDisk Flash Drive with or without the SecureSafe software.
You can drag and drop files to the root of the Flash Drive(as you would any Flash Drive), or into the SecureSafe.
Your work computer may prevent unauthorized USB Flash Drives from mounting onto its system or it doesn’t like the autorun action of the SecureSafe software.
If you don’t need the SecureSafe software, then backup your files on the Flash Drive, and reformat it.
This will erase everything on the drive and give you a blank drive.
Then drag all your desired files back to the Flash Drive and use it as a regular plain Flash Drive.
Let us know if this worked for you.