App store stopped working after update mavericks

After I installed the new operating system 10.9 (mavericks) on my MacBook Pro, the App store stopped working properly after the update: I can not update apps and can not download apps! - (nothing not free apps or paid apps )
This is want I got :
"We could not complete your purchase.
Failed to verify the preflight file. It is not signed by Apple."
my macbook pro 2012 retina 15'

Launch Keychain Access, go to the preferences, click on the 'Certificates' tab, and make sure both of the options are set to Best Attempt.

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After I upgrade lion to Mavericks, App Store stopped working, any idea how to fix this?

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Guys just contact apple support team . They will guide you well and your problem will most probably be resolved. I contacted them and following their instructions my mac is working totally fine again. If at all the problem persist the re-install mavericks by following steps
1). Switch of mac
2). Hold option/alt key and then switch it on.
3). Then choose your language and continue.
4). Now Re-Install OS X .
5). It will start downloading and installing.
6). Leave it idle for the required amount of time.
7). It will restart automatically and your problem will be definitely resolved.
Note:
a. If there is any problem of connection follow the same steps and the downloading will start where it stopped.

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Just checked again, took the Uno app out of resident memory by double-pushing the home button and holding the app icon til it starts to shake, and then hit the minus symbol, which deletes it out of resident memory.
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Message was edited by: Sonic Bodhi

My Plug in "Free Download Manager" stopped working after update

== Issue
==
I have another kind of problem with Firefox
== Description
==
My Plug in = "Free Download Manager" stopped working after I updated FIrefox !
It worked fine previously ! What did I do wrong ??
**** Also I've forgotten my User name, but Firefox says that my email is registered already
I was on some other Internet provider; and have been a PC user since 1987 ! I am a Retired Network Administrator for both Microsoft NT4 & Novell 4.x Networking; and a former IS Dept. Tech' for an Orlando, FL Corp' that had over 500 PC's;
both Lap & Desk Top for some 3 1/2 yrs.
***** I CONSTANTLY RECOMMEND FIREFOX TO EVERYONE THAT IS EITHER MY CLIENT -- OR ANY OTHER CASUAL CONTACT *****
***** In fact I suggested your Browser to 3 people Today; Wed. the 14th of July 2010 *****
Respectfully;
Raymond E Bachelor
aka "New System Services"
<blockquote>Removed personal info. Please don't out yourself, or post personal info on forums. thanks! -T </blockquote>
== This happened
==
Every time Firefox opened
== I updated Firefox to the Newest Version !
==
== Troubleshooting information
==
PLEASE !!!!
SEND ME MY LOGIN INFO I have an active email entry; but I've lost track of my Username over the years !
== Firefox version
==
3.6.6
== Operating system
==
Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6
== Plugins installed
==
*-Shockwave Flash 10.1 r53
*Adobe Acrobat Plug-In Version 7.00 for Netscape
*Office Plugin for Netscape Navigator
*np-mswmp
*getplusplusadobe16263
*Default Plug-in
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*Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
*Npdsplay dll
*DRM Store Netscape Plugin
*DRM Netscape Network Object

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Here is an article that can give you some tips about using your computer with your external monitor in closed clamshell mode:
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http://support.apple.com/kb/ht3131
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For best results it is recommend that you put your computer to sleep before disconnecting your display.
Note: Some DVI and Mini DisplayPort displays—including Apple's aluminum-framed DVI displays and the 24-inch and 27-inch LED Cinema Displays—can be unplugged without putting the computer to sleep. If you aren't sure whether your display supports this feature, put your computer to sleep before unplugging the display.
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Mac App store not working after installing maverics

i m having trouble opening App store on
Device: MacBook Pro
Processor 2.4 GHz Intel Core i5
Software OS X 10.9 (13A603)
09/11/13 11:02:27.412 am com.apple.launchd.peruser.501[181]: (com.apple.appstore.11120[3170]) Exited with code: 1
this reply i m getting on console when trying to access app store from dock icon. but it not opening,
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Thanks for visiting Apple Support Communities.
If the Mac App Store is not launching in Mavericks, there are a few steps that can help isolate or resolve the issue.
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http://support.apple.com/kb/ht1564
Mac OS X: Starting up in Safe Mode
http://support.apple.com/kb/HT1455
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OS X Mountain Lion: Create a new user account
http://support.apple.com/kb/PH11468
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In your opinion Apple was doing a garbage job, when in fact it was Intego that trashed your Mac. That's all it is capable of doing.
But now I have no virus protection.
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Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
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Don’t install Java unless you are certain that you need it:
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Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
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If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
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Updates tab in Mac App Store stopped working.

I don't have time to test all of these to find out for sure which one it may be, so I thought I'd post it here in case someone might already know the answer. I disabled and removed a bunch of features from my iMac running Mountain Lion 10.8.5 and one of these caused the Updates section of the Mac App Store to stop working and return the error "The App Store is temporarily unavailable. Please try again later." Anybody know what might be causing this? Thanks, and please don't bother asking why I would do any of this, that doesn't help. This isn't a complete list of things I changed but I've narrowed it to one/some of these.
> Removed Game Center.app and Messages.app (including accompanying files found by) with App Cleaner
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> Removed the notes migrator service from /System/Library/PrivateFramerworks/Notes.framework/Versions/A/XPCServices/com.a pple.NotesMigratorService.xpc/Contents/MacOS
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> sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.findmymacmessenger.plist
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We aren't allowed to discuss 10.10 in this forum. Try the Developers Forum.

App store stopped working after update mavericks

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