Just a shot... when you installed ActivehomePro it has specific instructions on how AND When to install and plug things in.
did you follow these carefully? Install software first, it will ask you to install (connect) the hardware after not before.
When I Installed AHP I had Windows find hardware and ask me to install it when I plugged in my X10 hardware (not ATI but windows asking), since X10 is not a registered program it installs the hardware on its own. meaning the pop up that windows does to install any hardware to your computer should not be done too. when I installed AHP I chose to close windows popups and allow X10 AHP to install the hardware as the instructions say instead of allowing windows to do it.
you may have 2 drivers installed, one by windows & one by X10 in conflict?
you might be able to just disable one in device manager?
if this doesn't do it, more info on your PC and setup is needed.
proper re installation of X10 isn't simple...
after following these instructions below you should also check hardware (device manager) and make sure to uninstall anything you don't have.
At step 12 and before reinstalling software, remove all hardware and reboot a couple times.
right from X10 themselves....
You should reinstall ActiveHome Pro.
1. Go to Control Panel | Add/Remove Programs and click on the 'Add/Remove' button for Activehome Pro. Note: You may receive a message saying "Could Not Find Install.Log." If you get this, delete the folder at C:Program FilesActiveHome Pro. Run the ActiveHome Pro installer again, and repeat Step #1.
2. A window will pop up asking if you would like to do an 'Automatic' or 'Custom' uninstall. Select 'Custom.'
3. Click on the 'Select all' button, and then the 'next' button on every screen in the Uninstall Wizard.
4. Click 'Finish.' Repeat steps 1-4 for X-Ray Vision, X10 Hardware, and any other X10 software installed.
5. Reboot the computer.
6. Go to My computer | C: | Program files | Common files.
7. Delete the 'X10' folder. If you receive a message that states you cannot delete this folder, go to step 8. If you can delete it, go to step 12.
8. Press the Crtl, Alt, and Del buttons on your keyboard at the same time to bring up Task Manager.
9. Click on Processes. End process for x10net.exe.
10. Delete the 'X10' folder in the 'Common Files' folder.
11. If this does not work, reboot the computer and repeatedly press F8 while it loads to bring up the Safe Mode menu. Boot into Safe Mode and delete the 'X10' folder in the 'Common Files' folder.
12. Reboot the computer.
13. Disconnect your CM15A ActiveHome Pro Interface.
14. Install the ActiveHome Pro software, and plug in the CM15A when prompted.
15. Reboot the computer again.
The Activehome Professional software should now operate correctly. If you receive a message that states the device is not recognized, unplug the CM15A from the wall and computer. Remove its batteries; then plug it back in to the wall and computer. The device should now be recognized by your computer.