I'd love to take all your money...but...
PicBasicPro is completely capable of doing what you need to drive that box. ($149 for that thing?...jeeze, you can almost put together another PC for that amount). If you have PBP, read the manual, specifically the SERIN/SERIN2/SEROUT/SEROUT2 sections.
In fact, PBP and a PIC18F2550 is completely capable of doing what you need to drive a PC thru the USB port...but requires a fair amount of knowledge.
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