Itunes update stopped and now can't open

I downloaded the latest version of itunes and whilst in the middle it stopped (not sure if this may have been my fault!!). Anyway itunes won't open. I've tried reinstalling and when i do so it doesn't work as it says i need to be logged in as an administrator which i am as i am the only user for my laptop.
real-time player still works fine though. I have also tried to uninstall itunes via control panel but it doesn't show as a program anymore.
Can anybody help??
Thanks
C

I don't know about a couple hundred -- that sounds excessive -- but we all get those Java repairs whenever repairing Permissions.
http://support.apple.com/kb/TS1448?viewlocale=en_US
You might want to see if running Applejack will help. Be sure to do the underlined. Some of this will be redundant, since you've already done Permissions repair. But no harm.
Download:
http://sourceforge.net/projects/applejack/
Article on using:
http://reviews.cnet.com/8301-13727_7-10334620-263.html?tag=mfiredir
It runs in single user mode, where it runs more safely than other maintenance/cleaning programs because there is less chance of interference from the OS. After installing (you won't see it in the Applications Folder) hold CMD-S at startup. You will get a black screen with MS-DOS like text. Just follow the prompts: type in "applejack AUTO" and it will run through the following:
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
You can also run tasks selectively and for specific users by typing in "applejack." After running in "AUTO,"  you can go back and run it again as "applejack," steps 3 & 4 only, for your user.
The first reboot will take much longer than usual, as it rebuilds caches. It may take several restarts to see the benefits. Because of the deep cache cleaning in AUTO mode some applications may tell you they are being opened for the first time.
NOT YET UPDATED FOR LION (although it is reported by some that it is working)
(Adapted from post by BDAqua)

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