Hello! I’m sorry to hear that PDFgear crashes immediately after opening on your Windows 10 device. Let’s work together to get this sorted out. To start, could you please confirm:

1. Did PDFgear ever work fine on this device or is this the first time you installed it?
2. Have you recently installed any updates or new software that might coincide with this crashing behavior?
3. Do you see any error messages when it crashes, or does it just close immediately?

In the meantime, here are some initial steps to try that often help resolve app crashes:

1. Restart your computer. This clears temporary glitches that might cause app crashes.
2. Update PDFgear to the latest version. Sometimes bugs get fixed in new updates.
3. Run PDFgear as administrator. Right-click the app icon and select “Run as administrator” to check if it’s a permissions issue.
4. Temporarily disable antivirus or firewall. Sometimes security software interferes with app launching.
5. Check for Windows updates. Make sure your Windows 10 is fully updated with all patches installed.

If the app still crashes, then we would move to:

6. Reset or clear PDFgear’s cache or app data. This removes corrupted files that cause crashes.
7. Reinstall the app. Completely uninstall PDFgear, reboot, then install it fresh.
8. Check Event Viewer logs. This Windows tool can show specific error messages related to app crashes.

Could you please try these and let me know which step you reach or if anything changes? Also, if you have PDFs auto-opening with PDFgear, do those documents have any unusual characteristics like being very large or encrypted?

I’m here to help you troubleshoot this thoroughly. Let me know your results!