I am getting the following every now and then on my spreadsheets tat have Macros. This is a new issue i'm having with excel and running the same Macros for the past two years. How can I fix this without having to re save my files and re open them on another
machine, re save and then they will work fine for a while

Here is the event viewer error
-
<Event xmlns="**http://schemas.microsoft.com/win/2004/08/events/event**">
-
<System>
<Provider Name="Schannel" Guid="{1F678132-5938-4686-9FDC-C8FF68F15C85}"
/>
<EventID>36888</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2015-05-18T11:45:39.624938400Z" />
<EventRecordID>13285</EventRecordID>
<Correlation />
<Execution ProcessID="824" ThreadID="868"
/>
<Channel>System</Channel>
<Computer>Larry</Computer>
<Security UserID="S-1-5-18" />
</System>
-
<EventData>
<Data Name="AlertDesc">10</Data>
<Data Name="ErrorState">10</Data>
</EventData>
</Event>