By john 
Every time the PC starts, a blue menu asks you to choose an operating system, listing two copies of Windows 10, or an old “Windows 7” entry that no longer exists. When the Windows 10 boot menu shows old Windows entry, startup is delayed by a countdown, and choosing the wrong https://puigmal2900.com/ entry leads to an error.
The boot menu is built from the Boot Configuration Data, a small database that lists every installation Windows knows about. Upgrades, reinstallations, and dual-boot experiments can leave old entries behind.
Removing an outdated entry tidies the menu and speeds up startup.
Windows provides a safe tool for this in the System Configuration window.
The menu often appears after reinstalling Windows over an existing installation, or after an upgrade that kept a copy of the previous system.
What Might Be Causing It
Extra boot entries appear for these reasons:
- Windows was reinstalled without formatting, leaving the old installation listed.
- An upgrade from an earlier version left a previous entry.
- A second operating system was removed, but its boot entry remained.
- A repair or recovery tool added a duplicate entry.
The entry marked “Current OS” in msconfig is the one you are running and must not be deleted.
First Steps to Try
Clean up entries with msconfig.
- Press Windows + R, type msconfig, and press Enter.
- Open the Boot tab.
- Find the entry labelled “Current OS; Default OS.” Leave it alone.
- Select any other entry you are sure is not needed and choose Delete.
- Select Apply, OK, and restart.
The menu should no longer appear if only one entry remains.
Each entry in the msconfig list shows its location, such as C:\Windows. Entries pointing to a drive or folder that no longer exists are safe to remove.
If the Problem Continues
Adjust or use bcdedit.
- Type “View advanced system settings,” open Startup and Recovery Settings, and reduce “Time to display list of operating systems” or untick it.
- Open Command Prompt as administrator and run bcdedit /enum to list entries.
- Note the identifier of the old entry.
- Run bcdedit /delete {identifier} for that entry, after backing up with bcdedit /export C:\bcdbackup.
- Restart and check the menu.
If you truly dual-boot, keep the second entry and simply lower the countdown time.
Protect Your Data First
Deleting the wrong entry can stop Windows starting. Always back up the BCD with bcdedit /export before deleting, and never remove the Current OS entry.
The Bottom Line
Old boot entries remain after reinstalls and upgrades. Remove extras in msconfig or with bcdedit, after making a backup.
If you later install a second operating system on purpose, its entry will appear again, and the countdown setting lets you choose how long the menu stays on screen.