Insert your images into the PhotoSmart scanner so that the bottom of the scan goes into the scanner first (it scans on the way out of the scanner).
Note that some slides get stuck on the way in when using the SCSI PhotoSmart if the scanner is running at slow speed. You may need to apply gentle pressure with your finger as it's first going in.
You may need to experiment with the insertion of slides and negatives in other scanners to get the default image rotation the way you want it.