My PowerPivot files are going corrupt

Somehow my computer has corrupted most of my PowerPivot files. Some that are stored on SharePoint still work, as long as i don't save them. As soon as i save it though, the next time i open it (or sometimes immediately after i save) i start getting
error messages. at first it was just the one saying the PowerPivot data is corrupt and then i would have to attempt to restore. it would usually restore, but it was annoying.
now i'm getting this error:
"Unable to load the VertiPaq engine because there was a COM exception while loading. This might happen if you load a workbook on a corrupt installation. To fix the problem, uninstall and then reinstall PowerPivot. Click Details for more error
information."
when this happens, i'm unable to use the powerpivot data at all. I've tried uninstalling and reinstalling. nothing. I've tried moving the file to another PC, same problem.
i've tried just about every suggestion on every support page or forum and nothing works. I've reimaged my laptop several times and the issue just keeps reappearing.
Win 7 64-bit / Office 2010 64-bit
here is the info from the "Details" button.
============================
Error Message:
============================
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
============================
Call Stack:
============================
Server stack trace:
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at Microsoft.AnalysisServices.XLHost.Addin.GeminiProxy.HandleMethodInvoke(IMethodCallMessage callMessage)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Microsoft.Office.Interop.Excel.OLEDBConnection.Reconnect()
at Microsoft.AnalysisServices.XLHost.Addin.InProcServer.LoadOLEDBConnection(Boolean raiseCompleteEvent, String errorCache)
============================

Hi Kevinbradshaw,
It's a bad new that you didn't backup all of your PowerPivot files, please backup the PowerPivot files immediately which are work for you.
What's the specific SQL Server PowerPivot for Excel version? The latest version of SQL Server PowerPivot for Excel 2010 is "11.0.3129.0", we can download it from the site below:
http://www.microsoft.com/en-us/download/details.aspx?id=29074
To install and use Microsoft SQL Server 2012 PowerPivot for Microsoft Excel, complete the following steps in this order:
Install .NET Framework 4.0 and Visual Studio 2010 Tools for Office Runtime.
If you are running Windows Vista or Windows Server 2008, install the platform update.
Install Microsoft® Office 2010.
Install PowerPivot for Microsoft Excel
So, please try to install the latest SQL Server PowerPivot for Excel version to see if this helps.
Elvis Long
TechNet Community Support

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