Cannot unmount any disk images

Hey guys, I've a problem. I can't unmount all the disk images that I've mounted. The same thing with usb external drives.
The only way to eject is going to utility disk and unmount the images frome there. It's really annoying... Anyone can help me? I'm not sure, but i think that the problem was due to of cocktail software.. I set all the default setting but the problem isn't solved...
thanks for your help.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you boot, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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Message was edited by: 100Day

Hi Every One
I know that this Problem happens with lots of people out there
It is not fault of Adobe, well Adobe is a good company, the problem is with the Vista Which has a hidden User Called Administrator.
Even if you are Administrator you don't have all the permission to access the files, All Permissions are only assigned to Core Administrator which is hidden.
If you want to enable that user here is the command for that
Open Run Type Cmd
and then type this ----- net user administrator /active:yes
now your hidden administrator is active, you can work with the hidden administrator. simply log off your user and log in to the new account named Administrator and enjoy more benefits for example you can start the setups and all other programs and the UCI will not pop up and will not distrube You every time plus you have access to every thing but there is only one problem that is security you must secure your computer with good firewall and antivirus coz now you are using core Administrator which have access to every thing.
Well This is the whole detail
Now we should come to the real problem which is faced by lots of Users of Adobe Encore CS3, That is Access Deneid while writing DVD above from 4.7 GB.
To Avoid that Simply right click on Adobe Encore CS3 and select Open as Administrator or the second way is to use core Administrator user.
Now every thing will work fine
Hope this will help you
Many Thanks
Siddiqullah Saleem

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