A few days ago, I was trying to fix a sluggish Windows 10 startup and read that editing the registry could help. I disabled some unnecessary startup services by tweaking the registry, but after a reboot, my PC wouldn’t start properly and kept going into a repair loop. Here’s how I fixed it: 1. Booted into Safe Mode: I accessed Safe Mode by interrupting the boot process three times to trigger the Advanced Startup menu. 2. Restored the registry backup: Luckily, I had created a registry backup before making changes. In Safe Mode, I opened `Regedit`, went to File > Import, and restored the backup. 3. Avoided manual edits next time: I learned to use tools like Task Manager or MSConfig for startup management instead of directly modifying the registry. After restoring the backup, my PC booted normally again.