Few things to try:
right click on the Arduino icon and select, one at a time:
- Run as Administrator. (if it works then there’s a permissions problem.)
- Troubleshoot compatibility. (Should say if this is W11 and Arduino misaligned)
- Properties. Copy whatever’s in the Target field. This is the full pathname to the Arduino IDE executable.
Having copied the full pathname, start cmd.exe (Microsoft’s command line interface), paste the pathname into the prompt and press enter. It will spew an enormous amount of status information on screen. You’re looking for any line that’s not INFO, and there’s a reasonable chance the last entry on the list will identify the problem.
Example: note my first attempt with just arduino.exe failed – it needs the full pathname
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I see the Arduino IDE on this machine, a W10 laptop, is out-of-date. I’ll update it to see if if breaks!
Dave