If every time you try to start Excel it crashes showing message saying that the program has stopped working – it might be that one of the installed extensions are failing and are causing Excel to behave like this.
To check if this is a case, try to open Excel in Safe Mode, disable all extensions and then in normal mode enable each one-by-one to see which one causes the problem.
Open Run Window by pressing Windows Key + R
and press Enter
Verify if Excel started in Safe Mode by checking title bar.
If Excel starts correctly we can be sure that the problem is in the one of the addins.
Let’s disable all of them now to start one-by-one in normal mode later.
Go to File -> Options
Click Add-ins tab. On right-bottom choose add-in types you are using and push Go… button
Disable Add-ins by unchecking items and clicking OK. Repeat for each add-in types.