Sharepoint 2010 correlation ID error

When a user logs in and hits the home page they get an error and a correlation ID. I cross referenced the correlation ID with the logs and get the below. Could do with some help figuring out why this occured. When the user closed their browser and re-opened it, it worked ok. This happened them a number of times.


System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.  
 at Microsoft.SharePoint.Publishing.Internal.WebControls.PublishingRibbonTrimmer.TrimPublishingGroup()    
 at Microsoft.SharePoint.Publishing.Internal.WebControls.PublishingRibbonTrimmer.TrimPublishTab()    
 at Microsoft.SharePoint.WebControls.SPPageStateControl.OnPreRender(EventArgs e)    
 at Microsoft.SharePoint.Publishing.Internal.WebControls.PublishingPageStateControl.OnPreRender(EventArgs e)    
 at System.Web.UI.Control.PreRenderRecursiveInternal()    
 at System.Web.UI.Control.PreRenderRecursiveInternal()    
 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)