Before i start, I'd like to thank in advance any help given and will be greatly appreciated. We have a user running a 64 bit version of windows 7. I have installed the 32 bit version of office 2013. We cannot use 64 bit for office due to a business critical add in that will only run on 32 bit office. For some time all of his office was crashing. It came out that a bottleneck effect was happening to the ethernet port we had him plugging into. Pretty much since we have set this new computer up for this user, his excel will randomly crash. I have attached the report.wer file for the excel crash. All his crash's are similar. At first I thought it was his dragon naturally speaking conflicting with excel dictation but it does not seem to be the case. I have yet to try uninstalling dragon to test but will do so soon. So far i have disabled all add in's to excel, ran safe mode for excel and for windows. Short of uninstalling and/or doing a repair i have tried everything for this users excel. In each crash report, his excel seems to point to the mso.dll being the fault. Any suggestions on how to fix this and/or possibly replacing this file? We cannot uninstall his office due to the highly customized settings he has with his office or delete his user profile for this reason. He does have his hotmail account (connected services) linked to his office, which i read can be an issue. Any help is appreciated.