Symptoms
- Explorer windows take a long time to open
- Explorer freezes when opening a specific folder
- Right-click menu takes a while to appear
- Explorer.exe crashes and restarts the taskbar
Likely causes
- CommonCorrupted or oversized thumbnail cacheWindows has to regenerate thumbnails for every image/video, which can bog down browsing.
- CommonA folder with an extremely large number of filesExplorer struggles to list and preview folders with thousands of items.
- CommonA slow or disconnected network drive/shared folderExplorer can hang while waiting to reach an unavailable network location.
- PossibleThird-party context menu add-ons from other softwareExtra right-click options from installed apps can slow the menu significantly.
- PossibleOutdated storage or network driversDriver issues can cause Explorer to stall when accessing certain drives.
What to do
- Restart File Explorer from Task Manager (find 'Windows Explorer,' right-click, Restart) to clear a temporary glitch.
- Disconnect any unreachable network drives or shared folders that might be causing delays.
- Clear the thumbnail cache: Disk Cleanup > check 'Thumbnails' > OK.
- If one folder is especially slow, check how many files it contains; consider splitting very large folders into subfolders.
- Disable unnecessary context menu add-ons using a free shell-extension manager, testing one at a time.
- Update storage and network adapter drivers from the manufacturer's site.
- Turn off 'Always show icons, never thumbnails' if you'd rather trade previews for speed (Folder Options > View).
- If Explorer keeps crashing, run 'sfc /scannow' from an elevated Command Prompt to check for corrupted system files.
Tools and parts
- None required
When to call a pro
If Explorer keeps crashing after these steps, a technician can check for deeper system file corruption or a failing drive.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.