Avision AV3200SU (300500001/300500002) - Manual (Page 22)

3-2
If not, press the Start button, choose RUN,and type
d:\driver\twain driver (or ISIS driver)\setup.exe (d means the
letter indicating your current CD-ROM drive). Click on the OK
button.
4. Follow the subsequent instructions on the screen to
complete the driver and application installation.