I am very sorry to hear you are having trouble. Could you try restarting your laptop and then launch the n8n desktop application from the command line and share the terminal output with us (without the tunnel URL which sould be kept secret)? The app would live in C:\Users\Username\AppData\Local\Programs\n8n\n8n.exe (replace Username with your actual Windows username).
Thanks @Soom, this is very helpful. That looks like the n8n config file has become corrupted. Did you perhaps modify it manually?
Perhaps you can open the C:\Users\User\.n8n\config file in an editor such as VS Code and make sure it contains valid JSON data?
If you struggle with this feel free to send me a DM with the file content (please do not share it publicly as it contains the encryption key for your credentials stored in n8n as well as the tunnel subdomain under which your instance is available) and I’ll take a look (I will be out until the middle of next week though, so it might take a bit before I can look at it).
Alternatively, you can also remove the file, but that would mean you have to re-create the credentials you have stored in your n8n database as n8n will no longer be able to read them without the aforementioned key.