OK this i how I install the Treo on Vista step by step.
1. Make a restore point and/or backup of your system.
2. Install bluetooth drivers and setup bloothtooth.
3. Pair Treo and bluetooth together.
4. Take note of com port on your bluetooth device.
5. Plug in Treo via USB cable and let Vista find it. (If it dosen't go back to restore point you just created and keep trying till it does)
6. Once found should download Windows Mobile Device Center 6.
7. Go here
http://www.microsoft.com/windowsmobi...icecenter.mspxand download update
8. Install
9. Run with Treo connected via USB and sync
10. Under Mobile device settings - click on connection settings - make sure that allow connections to one of the following is ticked and that the com port matchs the one from your bluetooth setup.
11. Disconnect from USB and sync via Bluetooth...
Happy syncing
If you cannot change com port to that of your bluetooth setup edit the following in the registry :
Run Registry Editor (type regedit in Start Search and press Enter).
Navigate to the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows CE Services
In the right pane, locate the value name “SerialPort”. Modify the value data from the default value of “Bluetooth or “Infrared” to “COM4, where COM4 is the virtual COM port associated to your Bluetooth incoming COM port. If your PC uses different COM port number, then choose the right COM port as the value (e.g. COM5, COM6 etc).
Exit Registry Editor.