OK, you've got the null modem cable. I presume it said "null modem" on the packet. Not all male RS232 plugs are null modem.

Silly question, but have you matched the comms port assigned in XP to that in the Meridian upload program?

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.