to start off, have a look at my post here...
AHP Software Problems v3.201in #3 on my list is a compatibility problem with ATI, I would wonder what hardware ATI all in wonder 9XXX you have? also what FCC ID is on the back of your ATI remote? If you have different hardware then what I have listed there I would like to add it to my list.
as for your problem.... when you install AHP it states to plug hardware in AFTER you have started installing the software (not before)
It will install the software then tells you to connect your hardware NOW. this is when to plug in your CM15A. AT THIS Time what does the AHP program tell you it is Installing? does it say your CM15A or does it tell you its installing more even though you only plugged in the CM15A at that time?
Also, when you plug in the CM15A windows will say new hardware found, you should cancel those as those do not apply to your CM15A and AHP install. that is windows installing your ATI product. you may have installed hardware now but not software? ATI uses a variation of the X10 CM19A (AHP states it is) windows states the CM15A is ATI when you plug it in.
I think I confused self there, let me know what it says during install?
make sure during reinstalls, you reboot and check your hardware section and remove them there if needed.
delete your X10 directory under Program Filescommon filesX10*.*
and try a search after, if there are other X10 files under windows... it most likely is your ATI remote.
I would need to know more about your multiple video card setup when you switch ect