The most basic form of assistance available to PC users is the software manual. At the very least, purchase a third-party book for each software package in use. Even better, purchase a workbook for self-teaching. These are good for introductory training, but can't finish the job. Make completion of the tutorial program a pre-requisite for the next step in your training course.
Video adds another dimension to print or audio media which can improve retention.
Seeing conveys more information and is more motivating. Training from a live instructor offers strong benefits. However, they lack flexibility and become outdated. The examples don't fit your work very closely, and you can't ask questions. On-site training offers convenience and lends itself to tailoring.