From their step-by-step manual:
Properly position your photo, filmstrip or slide on the scanner bed.
To scan transparent materials, you should install the Transparent Media Adapter before positioning your material and launching ScanWizard 5 (Refer to other documentation on installing the appropriate accessory).
To activate ScanWizard 5, click the icon on your desktop.
If you are scanning a film or slide, click Original Original, then select from the menu Positive (for slides) or Negative (for negative film from cameras).
Here's a link if you don't have the manual handy:
ftp://ftp.microtek.com/microtek/supp...u_SW5_0802.pdf