Apps cannot be installed because of missing signature (non-jailbroken iPhon

I was working on my iPhone 4 with iOS 4.2 (the last one) for a while, when I called my phone operator to unlock the simlock. I followed the procedure, and I saved of my iPhone with iTunes, then restored it, then restored the backup with iTunes (last version). I didn't do anything special but followed the path given by iTunes on a reset / restore procedure.
After the restore procedure, some apps that I have been using for months did not get installed. According to iTunes the two reasons are:
* Missing signature,
* or Resources modified.
This also happens with newly downloaded applications after the reset.
My iPhone is not (and wasn't) jailbroken, I never used anything else than iTunes to sync, and I don't understand what happened.
How may I solve this problem, without loosing datas, apps, music or photo libraries, or need to reinstall everything from scratch app per app ?
Some additional notes:
* Any app that I download now that doesn't want to install from iTunes, can be correctly installed when downloaded directly on the iPhone. And no sync problems with iTunes.
* Even updating a working and installed app can cause the problem.
* New error with an app download from iTunes : "Unknown error 0xE800000B"

I don't know why, but soon after posting this, I found a solution to the problem. The WMI part was solved in this thread:
http://social.technet.microsoft.com/Forums/windowsserver/en-US/953be9ef-e9e3-4885-a5c4-47fc475ba562/dfs-is-not-working-anymore?forum=winserverfiles
The relevant portion is this:
Open a CMD prompt in %windir%\system32\wbem
mofcomp dfsrprovs.mof
net stop winmgmt
net start winmgmt
net start iphlpsvc
net stop dfsr
net start dfsr
I don't know why recompiling of all mof did not solve the problem, but the solution above did. Restarting the DCs solved the communication issue. I don't know why the primary DC forgot about the WMI DFS provider or why communication failed. However, it is
working again, it seems.

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