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Did you try running the IMON software in XP Compatibility mode? I understand that fixed a few problems. I'd recommend eventghost but I don't think there's a driver for your IMON. Your best overall bet would be to find a Vista MCE receiver and use your Harmony which has built in MCE support. One other option is to use EventGhost which does support the Hauppauge Remote and either download (if available) or learn the Hauppauge commands. At least with EventGhost you can see what codes the remote is sending and translate them into MediaPortal commands. Did you see the writeup below? It's old but may help you with the IMON.MediaPortal - Setup guide for Silverstone LC16M Case | iMon Remote Setup, iMon VFD Setup, iMon Front Button Hack
Did you try running the IMON software in XP Compatibility mode? I understand that fixed a few problems. I'd recommend eventghost but I don't think there's a driver for your IMON. Your best overall bet would be to find a Vista MCE receiver and use your Harmony which has built in MCE support. One other option is to use EventGhost which does support the Hauppauge Remote and either download (if available) or learn the Hauppauge commands. At least with EventGhost you can see what codes the remote is sending and translate them into MediaPortal commands. Did you see the writeup below? It's old but may help you with the IMON.
MediaPortal - Setup guide for Silverstone LC16M Case | iMon Remote Setup, iMon VFD Setup, iMon Front Button Hack