You can send your log file to help@lbry.io : https://lbry.io/faq/how-to-find-lbry-log-file

Or check out this guide: https://lbry.io/faq/startup-troubleshooting

Most common reasons are:
1) Claymore miner running on port 3333 (Close claymore, start LBRY first)
2) non-English characters in your Windows username (see end of that troubleshooting guide on how to fix)