How to Fix Excel Not Responding or Freezing on Windows
Excel keeps freezing or showing not responding on Windows? Fix it fast: Safe Mode, add-ins, hardware acceleration, Office repair, and heavy files.
When Excel hangs or shows “Not Responding,” start it in Safe Mode to see whether an add-in is the culprit, then work through the simplest fixes first: disable add-ins, turn off hardware graphics acceleration, update and repair Office, and check whether the workbook itself is too heavy. Below is the order Microsoft’s own support guidance follows, from a two-second test to the deeper fixes, so you rarely have to reinstall anything.
Start with Safe Mode (the fastest test)
Safe Mode loads Excel without add-ins, custom toolbars, the XLStart folder, and hardware acceleration, which isolates most freezes in one step. Press Windows + R, type excel /safe, and press Enter. You can also hold Ctrl while you launch Excel and confirm the prompt. When it opens you will see “(Safe Mode)” in the title bar.
If Excel runs smoothly in Safe Mode, the problem is an add-in or a startup customization, not Excel itself. If it still freezes in Safe Mode, skip ahead to repairing Office or checking the file. Safe Mode is also the calm place to recover work before you tackle the cause, much like Safe Mode on Windows 11 is for the whole PC.
Track down a bad add-in
COM add-ins from PDF tools, accounting suites, and email clients are the most common cause of a slow or unresponsive Excel. In Excel, go to File > Options > Add-ins. At the bottom, set the Manage dropdown to COM Add-ins and click Go, clear every checkbox, click OK, and restart Excel normally. If the freeze is gone, re-enable the add-ins one at a time until the bad one reappears, then leave it off or update it.
Repeat the same process with the Manage dropdown set to Excel Add-ins (the .xlam and .xla files). Turning them all off and re-enabling them individually is tedious but it is the only reliable way to name the guilty extension instead of guessing.
Turn off hardware graphics acceleration
If Excel goes black in patches, flickers, or freezes while scrolling and redrawing, your GPU driver is a likely suspect. On Office 2016 through 2021 the switch lives at File > Options > Advanced > Display, where you check “Disable hardware graphics acceleration.”
Microsoft removed that checkbox from recent Microsoft 365 builds, so if you do not see it, set it in the registry instead. Close Excel, press Windows + R, type regedit, and open HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Graphics. Create a DWORD (32-bit) value named DisableHardwareAcceleration and set it to 1. Back up the registry key first, since a wrong edit here affects all your Office apps. Updating your graphics driver often fixes the same glitches without touching the registry.
Rule out antivirus, then update and repair Office
Third-party security suites sometimes hook into Excel and stall it, especially when saving to a network folder or opening downloaded files. Make sure your antivirus is fully updated, then temporarily disable its Office or Excel integration to test. If that clears the freeze, keep the antivirus but leave its spreadsheet scanning off, or switch to a lighter tool. Our take on whether you still need antivirus can help you decide.
Next, install the latest Office updates: File > Account > Update Options > Update Now (choose Enable Updates first if it appears). If freezes persist across every file, repair the installation. On Windows 11, right-click Start > Installed apps, find Microsoft 365, click the three dots, and choose Modify. Run Quick Repair first (it is fast and works offline); if that fails, run Online Repair, which reinstalls the apps and needs an internet connection. You can also reach it through control > Programs and Features > select Microsoft 365 > Change. If Excel refuses to open at all, our guide to an app that won’t open on Windows covers the wider fixes.
When the workbook itself is the problem
If only one file freezes, the file is likely doing too much work. Formulas that reference whole columns (like A:A) and volatile functions such as NOW, TODAY, RAND, OFFSET, and INDIRECT recalculate on every edit and can lock up a large sheet. Switch calculation to manual through Formulas > Calculation Options > Manual, then press F9 to recalculate only when you choose.
Excessive conditional formatting is the other frequent offender: hundreds of overlapping rules force a redraw on every change. Trim them from Home > Conditional Formatting > Manage Rules, and remove rules that apply to entire columns. A dense workbook built on lookups and summaries runs better when those are consolidated into a pivot table instead of thousands of live formulas. If every large file drags, the machine may be short on memory, which is the same story as a Windows PC that feels slow.
Symptom, cause, and fix at a glance
Work down this table from top to bottom; the earlier rows are quicker and more likely.
| Symptom | Likely cause | Fix |
|---|---|---|
| Freezes on launch or with every file | Add-in conflict | Start in Safe Mode (excel /safe), disable COM and Excel add-ins, re-enable one by one |
| Screen goes black, flickers, or stutters on scroll | Hardware graphics acceleration / GPU driver | Turn off acceleration (Options > Advanced > Display or the registry DWORD); update the graphics driver |
| One big file hangs while editing | Heavy formulas, volatile functions, too many conditional formats | Set calculation to Manual, fix whole-column references, trim formatting rules |
| Random hangs across all files | Outdated or corrupt install | Update via File > Account, then run Quick Repair, then Online Repair |
| Stalls when saving or opening from a folder | Antivirus integration | Update the antivirus and disable its Excel add-in |
Keep Excel from freezing again
Most repeat freezes trace back to two habits: piling on add-ins and letting one workbook grow into a maze of volatile formulas and conditional formats. Keep only the add-ins you actually use, let Office update itself, and split giant tracking files into leaner sheets that lean on pivot tables and manual calculation. If a specific file starts freezing again, open Excel in Safe Mode first, recover your data, and then reopen the file normally to confirm whether it is the file or the app. That two-step check saves you from reinstalling Office over a problem that lived in a single spreadsheet.