Yeah it's a bit skimp on connectables, but the benq unit has one USB (albeit mini) which allows you to connect a hub to it. That way you can connect as many USB devices to it. This is the guide to
installing winXP. Looks simple enough. I'm not sure what software you guys are wanting to run, but there is also a workaround apparently (also on that page) that allows you to shift file directories to external SD card since the 2gb internal is a bit light. PHD guiding software is only 10mb so there should be enough space for that and it apparently runs on winXP so i'm not sure what the cpu requirement is. If you only have barebones installed, i guess it should run ok?