When you installed the bluetooth adapter, did you use the CD that came with the adapter? If you did, you may want to remove the software and let Windows install the software. When the instructions refer to Vista, use the same method for win7.
In the instructions it states the following regarding the virtual serial port setup.
"For Windows Vista, select Next three times to skip the three steps for setting up a virtual serial port. Bluetooth synchronization on Windows Vista doesn't use virtual serial ports".
Click on the following link to the kb.palm.com webpage for the article regarding Synchronizing under 64-bit Windows editions: Bluetooth HotSync setup.
http://www.palm.com/cgi-bin/cso_kbURL.cgi?ID=49229
Go through the article and see if you can resolve the issue.
For reference purposes, click on the following link for the support page for your device on the kb.palm.com webpage.
http://kb.palm.com/wps/portal/kb/na/zire/72/unlocked/home/page_en.html
There are links on the page to the user guide, troubleshooting, how to's, downloads, etc.
