hey im new here and was haveing the same problem but them someone on zune.nets forums posted this,
Alright guys! MyJules, a Zune Team Member on here, has been communicating with me and just sent me an email that fixed my install. I don't recommend this to anyone just yet who is not comfortable using regedit. Make a restore point before doing this. What you need to do is go here in the registry:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Win dows\Installer
Then create a new DWORD value and name it:
DisableRollback
Then modify it to 1
close regedit and reboot.........install the zune software
Setup will still fail but it will NOT rollback. Check and see if you have zune files or not on your system. It should be in c:\Program Files\Zune
Then you can click on zune.exe in that folder. Now mine did come back up and say there was an update to 2.1 again and went back thru the install and error out, but it's installed and working.
After you have the software on and working, I was advised we should delete that registry key.
I really hope this works for you all that are having the 80070643 error and my sincere thanks to the Zune team members for their hard work!!!
THIS WORKS!! like i said beofre was having the same problem but now since i did this it installed, so i have the updated player and Zune firmware.
Enjoy everyone
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