“iTunes +QuickTime” has an invalid signature. It will not be installed.
I recently ran into this issue when running Apple Software Update on my Windows XP machine and searching the Internet did not give me any good leads. What I did seems to be working so I will share:
Go to Task Mangler (Task Manager for those who want literal names) and End the Processes anything to do with Apple.
Go to C:\Program Files\Common Files\ and remove the Apple folder.
Launch Apple Software Update and it should have the iTunes and Quicktime under the Optional software again.
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About Me… Zeff Wheelock
Let me introduce myself, My name is Zeff Wheelock. No, wait, not really. My real name is Joseph A. Wheelock III. That means that there is a Joe Wheelock, Sr., Joe Wheelock, Jr. and now me, Joe Wheelock III. My mother, in her infinite wisdom, decided to call me Zeff to differenciate me from the other two Joe’s. Where does Zeff come from? Joseph, Joe-ZEFF. The name has stuck with me so far. I plan on keeping it for another 50 years, then I will decide then what to do.
I am an email administrator using Lotus Domino. I am an Administrator/Semi-Developer for Domino, meaning I can write little programs to make my life easier in Domino. I support Research in Motion Blackberry’s as well. I also support PGP Universal Server, IronPort and McAfee Secure Content Management servers.
I have a step-son and a son, 22 years apart. They both are great and they get along great!
Zeff Wheelock 
How about for mac users? : ) Thanks
Comment by Knama | October 2, 2011 |
I haven’t seen that happen on my Mac. Only my Windows XP machine. I would imagine the solution would get rid of the preference file.
Comment by Zeff | October 3, 2011 |
I cannot remove the Apple folder in “common files”
Comment by Amanda | November 3, 2011 |
This did not work
Does the Apple file have to be completely deleted?
Comment by JoeZEFF | January 30, 2012 |
This worked for me on a windows vista notebook. Yes, “remove” means “delete.”
Comment by M. Metz | July 30, 2012 |
I cant delete it it says try again, and when i tried moving the folder outside to program files it wouldnt move all of them WTF should I do?? 😦
Comment by Frank Murphy | September 23, 2012 |
thank you so much to user: Zeff… problem solved! thank you
Comment by Anthony | January 12, 2013 |
tried it and “cannot delete ASL.dll: acess is denied” screen came up
Comment by David | January 15, 2013 |
I had trouble removing the Apple file. Just keep checking the Task Manager when AppleMobileDevice appears again & make sure to remove iTunes. 🙂
Comment by healingturtle | January 19, 2013 |
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Comment by Richelle | May 3, 2013 |
Zeff – I am using your advice re: signature error – will let you know if it worked. I run Windows 7. Have you ever seen iPhones never want to update. I have the 4S version and 2 of the returned iPhones failed to want to update. Was wondering if you ever saw this before. 2 of the 3 iPhones failed to update. Same router and wireless internet service.
Comment by Jeannine | June 11, 2013 |
this worked beautifully for me! Great advice!
Comment by jjmofro | September 14, 2013 |