I had the same issue too. Windows has attempted to searching "Renesas RSK USB Serial Port " Driver, but "not found" in result. As @FrankL said above, it seem that this driver is attached with DVD package. I tried to installed e2studio (with RX-CCRX Compiler Package) in PC that already connected to RSK Board. In installing progress, I saw that USB Serial is installed in RX-CCRX Compiler Package Step. I thinks this issue can be solved by re-installing CCRX Package with connection to RSK Board. Anyway, It works for me with RX64MRSK Board. Thanks for suggestions.
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