Editing those files allows you to delete Push to Talk and VAD, which I don't use and take up memory space. And I like some of the other vendor themes, so I can add them to my phone as I wish.

I did try it without any editing and it still didn't work on Vista. All I did was delete the vendor.xml and then plugged in the BB. Desktop Manager told me no updates were available. I unistalled and reinstalled the OS, and restarted the PC three times and it didn't work .

So, I gave up on using my home PC and did the upgrade on my work laptop which runs XP. After downloading DM 4.5 and the OS in the first post here, about 30 minutes later, I had upgraded my phone. Based on this, I going to say Vista is the issue. Should have spent the extra $160 for XP on the home PC I guess.