Issue Description
Installing another OS can overwrite the Windows bootloader, preventing Windows from starting.
Common Causes
- Dual-boot misconfiguration
- Bootloader overwritten
Step-by-Step Solution
Step 1: Boot Into Windows Recovery
- Insert Windows installation USB
- Boot from USB
- Select Repair your computer
Step 2: Open Command Prompt
- Go to Troubleshoot → Advanced options → Command Prompt
Step 3: Repair Bootloader
Run commands one by one:
bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
Step 4: Restart and Test
- Restart PC
- Confirm Windows loads correctly
Explore Further
- Repair EFI partition manually
- Reconfigure Linux bootloader
Prevention & Best Practices
Always back up before installing another OS.