If you have a stripes in your image in regular and broad fashion with no variation in colors, please try the following:

1) Start SilverFast only up to its welcome screen
2) Click on “Service Dialog” on the lower left corner
3) Click on the “Reset SN and quit” button on the right
4) Restart SilverFast, go to -> Start in the lower right, and reenter the serial and first name, last name combination when asked for it
5) Click Unlock

6) Click on Start and go back into the program.

This should fix the stripes issues for good.