I am having problems updating itunes 10.4. I am getting a message that says invalid signature. any suggestions?

does anyone have any suggestions. I haven't changed anything on my computer. I can't update itunes, quicktime or safari

Many thanks for the screenshot. (The key to these is knowing which particular .msi file is being mentioned by the message.)
(1) Download the Windows Installer CleanUp utility installer file (msicuu2.exe) from the following Major Geeks page (use one of the links under the "DOWNLOAD LOCATIONS" thingy on the Major Geeks page):
http://majorgeeks.com/download.php?det=4459
(2) Doubleclick the msicuu2.exe file and follow the prompts to install the Windows Installer CleanUp utility. (If you're on a Windows Vista or Windows 7 system and you get a Code 800A0046 error message when doubleclicking the msicuu2.exe file, try instead right-clicking on the msicuu2.exe file and selecting "Run as administrator".)
(3) In your Start menu click All Programs and then click Windows Install Clean Up. The Windows Installer CleanUp utility window appears, listing software that is currently installed on your computer.
(4) In the list of programs that appears in CleanUp, select any Bonjour entries and click "Remove", as per the following screenshot:
(5) Quit out of CleanUp, restart the PC and try another iTunes install. Does it go through properly this time?
(Assuming that the QuickTime and Safari messages were also citing bonjour64.msi, you should also then be good to go with those installs too.)

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