A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi, @Adjudi cation
Sorry you're dealing with this, it's frustrating when Excel won't even open. Since the repair and add-in steps have already been suggested, here are a few other things worth trying.
First, does the error pop up only when you double-click a specific file, or also when you open Excel by itself from the Start menu? If it's just one file, open Excel first, then go to File > Open > Browse, click the small arrow next to the Open button and choose Open and Repair. That handles a damaged workbook rather than a broken Excel.
If Excel itself won't start, try these:
Open Word or another Office app, go to File > Account > Update Options > Update Now. A pending update sometimes fixes this.
Press Windows + R, type %appdata%\Microsoft\Excel\XLSTART and hit Enter. Move anything in that folder to your Desktop, then try Excel again. Excel loads whatever is in there on startup, so one bad file can block it.
Run the Excel troubleshooter in the Get Help app, which checks startup files and toolbar settings automatically: Excel not responding, hangs, freezes or stops working
Check that your license is still active at https://account.microsoft.com/services. If it's there, open Word, go to File > Account, sign out, restart the PC and sign back in.
Let me know what you see after these and I'll help narrow it down further.