AppleMobileDevice using upto 100% of CPU, pls help

I have recently downloaded itunes 10.5.0.142 and since then I'm having major problems.
When i start up the computer the AppleMobileDevice is using 100% of the CPU and won't allow me to do anything until the process is stopped.  When i do finally get on to itunes i cannot connect to ITunes store.
I have tried removing all of the Itunes, apple software and quicktime and reloading it but the same problem still occurs.
Any advice please?

ssls6 wrote:
4) I would remove finder plist files (com.apple.finder.plist from ~/Library/Preferences)
This is less effective than it once was because Mavericks caches plist files, so even if you trash the plist file(s) it will continue to use the cached versions, & if anything in one of them is updated, the cached version gets written back to the Preferences folders, making it harder than it used to be to get rid of corrupted ones.
Supposedly, you can force the cached version to be flushed with a "defaults read" Terminal command, but you need to know which domain name to use with the command for this to work. (See the man page for defaults for the appropriate syntax.)
For some plist files an immediate restart does the same thing, but unfortunately many Finder plist files are updated at shutdown or log out time, so this is sort of hit or miss.

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