EXP Computer ThinCD E series for CDE-2440(PCMCIA Model), CDE-2450(USB Model), CDE-2465(Parallel Model) - Manual (Page 12)

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8. When the Unknown Device box pops up, keep the driver diskette in
the floppy drive and click Next three times. You should now see the
screen below.
9. The Wizard will ask you to specify a path to copy the needed file to
the hard disk. Type A:\ in the Copy files from box, then click OK.
10. After the files have copies onto the hard disk, you should see the
screen below. Click Finish to complete the installation.