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OK.

Try this:-

http://kinggeek.co.uk/downloads/tablet_digitizer/usb-serial-isdv4-kinggeek-modified_Plus_reg_entries.zip

There is an additional folder in the .zip called REG.

1) Uninstall the old driver
2) Install the newer one
3) Install all the reg entries from the REG folder.

This is tested and working on a new system, but I've not yet figured out the difference between the versions. Please let me know if it works.