Can't install .Net Framework 3.5 on W8 Enterprise

We started to deploy W8 on our Institution, however we can't install .Net Framework 3.5. We've succesfully installed Framework 3.5 on W8 Professional, but not on W8 Enterprise.

We've tried all troubleshoot methods in "Error codes when you try to install the .NET Framework 3.5 in Windows 8 or in Windows Server 2012

http://support.microsoft.com/kb/2734782", and the method in here "Installing the .NET Framework 3.5 on Windows 8

http://msdn.microsoft.com/en-us/library/hh506443.aspx" with no luck.

Here are the part of the dism log that we found important.

2013-03-11 11:43:54, Error DISM DISM Package Manager: PID=2792 TID=3960 Failed finalizing changes. - CDISMPackageManager::Internal_Finalize(hr:0x800f081f)

2013-03-11 11:43:54, Error DISM DISM Package Manager: PID=2792 TID=3960 The source files could not be found their location must be specified using the /source option to restore the feature. - GetCbsErrorMsg

2013-03-11 11:43:54, Error DISM DISM Package Manager: PID=2792 TID=3960 Failed processing package changes with session options - CDISMPackageManager::ProcessChangesWithOptions(hr:0x800f081f)

2013-03-11 11:43:54, Error DISM DISM Package Manager: PID=2792 TID=3960 Failed ProcessChanges. - CPackageManagerCLIHandler::Private_ProcessFeatureChange(hr:0x800f081f)

2013-03-11 11:43:54, Error DISM DISM Package Manager: PID=2792 TID=3960 Failed while processing command enable-feature. - CPackageManagerCLIHandler::ExecuteCmdLine(hr:0x800f081f)

Here are the part of the cbslog that we found important.

2013-03-11 11:43:54, Error CBS Failed to process single phase execution. [hrESULT = 0x800f081f - CBS_E_SOURCE_MISSING]

2013-03-11 11:43:54, Info CBS WER: Generating failure report for package: Microsoft-Windows-Foundation-Package~31bf3856ad364e35~amd64~~6.2.9200.16384, status: 0x800f081f, failure source: Stage, start state: Installed, target state:

Installed, client id: DISM Package Manager Provider

.

.

.

2013-03-11 11:43:54, Error CBS Failed to perform operation. [hrESULT = 0x800f081f - CBS_E_SOURCE_MISSING]

We've also tried copying the sxs folder from the media to the hard drive and mounting an iso file as cd-rom, with the same results.

Just don't know what else to do, this is all that Google have to resolve this problem.

Thanks,

David

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