You can download driver for Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 here, but DriversKit`s Team strongly recommend you to use Driver Updater Pro for finding the latest version of this driver. You can download Driver Updater Pro here.
Also you can:
Search Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 driver at Google
Search Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 driver at Yahoo
Search Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 driver at MSN
Search Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 driver at Teoma
Search Microtek ScanMaker V6USL/V6UPL/X12USL ScanWizard 5 5.90 driver at AltaVista