I installed an update and now I can't open App Store or iCal.

I installed an update, but now when I try to open App Store or iCal, I get this error message:
"App Store cannot be opened because of a problem.
Check with the developer to make sure App Store works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X."
I've tried restarting the computer, and I read that removing the programs from your dock and then putting them back could fix it, but neither worked. What's wrong and how do I make it work?

Same problem here. In fact, it started when I installed Mac OS 10.8.1. Since, everything was working super slow. Tried all the tricks that I've read here but nothing worked.
Had to restore my whole Mac from Time Machine. Then everything started to work smoothly except for one thing: App Store cannot open anymore. So I can't install the new Mac OS 10.8.2.
I've downloaded it from Apple, but it won't install. It says Mac 10.8.2 failed due to an error.
I just don't know what to do. So far, Mac OS 10.8.1 has been a giant nightmare to me. I'm a graphic designer who works on Macs for years and years so it's not that I don't know how it works.
I'm hopeless now.

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hope you can find the sloution that will slove this problem
thanyou

Sorry to hear that the software update failed. Unfortunately, it sounds like you need to perform a software repair on your phone via Bridge for Mac.
Wait to connect the phone via USB cable to your Mac > In Bridge for Mac, click at Xperia > Repair Xperia device > Continue > Select your device.
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Note that the phone should be powered off while doing this repair. Disconnect the phone from any kind of power source and hold down the ON/OFF + volume up(+) button for 5-10 seconds and you should force a shutdown.
- Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

Tried to update and now I can't open Itunes at all...

I don't know what I did wrong but last night I wanted to purchase some music to download on my nana gen 1 and it wouldn't let me unless I updated, so I did...well now my itunes won't open at all! The shortcut Icon is on my screen but it won't work...HELP!!! I don't want to lose all of my music! I wan't to cry!! Does anyone know what to do?

Hello bajura007,
Thank you for the details of the issue you are experiencing with installing the latest iTunes update. I recommend following the steps below:
Resolution
Follow these steps to resolve the issue:
Check for .dll files
Go to C:\Program Files (x86)\iTunes and C:\Program Files\iTunes and look for .dll files.
If you find QTMovie.DLL, or any other .dll files, move them to the desktop.
Reboot your computer.
Note: Depending on your operating system, you may only have one of the listed paths.
Uninstall and reinstall iTunes
Uninstall iTunes and all of its related components.
Reboot your computer. If you can't uninstall a piece of Apple software, try using the Microsoft Program Install and Uninstall Utility.
Re-download and reinstall iTunes 11.1.4.
When you get to the step to uninstall iTunes, it is important to uninstall iTunes and the related components in the order listed in the link for that step.
You can find the full article here:
iTunes 11.1.4 for Windows: Unable to install or open
http://support.apple.com/kb/TS5376
Thank you for using Apple Support Communities.
Best,
Sheila M.

I installed an update and now itunes won't open.

It doesn't even jump when it's clicked on and I tried to re-install to no avail, help!
I rlly don't want to lose my music library. Any help would be greatly appreciated but I've tried everything I can think of and looked on other discussion boards for a similar problem.. SOS

You only risk losing your music library (and your photos, and everything else for that matter) if you don't maintain a backup of your computer. When your drive dies (and it will) it will all be gone.
As for this issue:
Apr. 2015 Niel post: Re-install iTunes application - https://discussions.apple.com/message/28055467#28055467 - delete the old application first, with instructions on how to do that.
April 2015 LincDavis post with a bit more detail on the method Niel outlines - https://discussions.apple.com/message/28101611#28101611
A similar technique by Ben.d using Terminal to delete the application - https://discussions.apple.com/message/28036630#28036630 Normally you don't have to delete an old application but this time it seems to be necessary for some.

I installed an update and now I can't open App Store or iCal.

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