From the info box on the CW for HCS12X 4.7 download page:
LIMITATIONS:
WINDOWS VISTA SPECIFIC LIMITATIONS:
The following limitations are applicable only if you are installing the product on Windows Vista:
1. During installation, security messages may pop up concerning drivers being installed. It is highly recommended to click on the option "continue anyway..", so the driver can be installed.
2. When opening the Codewarrior components (IDE, Debugger etc.) Firewall warnings may appear with the option to block or unblock the application. It is advisable to click on the unblock option to continue.
3. For more VISTA specific limitations after the installation, please refer to:
"{INSTALLATION DIRECTORY}\Release_Notes\HC12\Notes_CW_HC12_Vista.txt"
---Tom