If we ask you to send us the log from Windows Event Viewer you can follow these steps:
1) Open Event Viewer.
2) Choose Event Viewer (Local), as follows Windows Logs and as follows Application (tree structure on the left side).
3) After right clicking on item Application, choose Save All Events As. Save as type: Event Files (*evtx).
4) In the next window please choose No display information and click OK.
Send us saved file.