Windows startup repair error code 0x490 happens when the system's BIOS is not configured properly. This can happen if the system is upgraded from an older version of Windows, or if the BIOS is not set to the correct boot order.
1. Restart the computer and try again
- Click on the Start button.
- Type "reboot" into the search bar.
- Click on the "Reboot" button.
- When the computer restarts, press F8 to open the Advanced Boot Options menu.
- Click on the "Safe Mode with Networking" option.
- Click on the "Startup Repair" option.
- Click on the "Repair" button.
- If the error code is 0x490, the computer will restart again and the repair process will start.
2. Use the System File Checker tool to scan for and repair missing or corrupted system files
The System File Checker tool scans for missing or corrupt system files and reports any problems it finds. You can then use the Repair option to fix the missing or corrupt files.
3. Use the Bootrec.exe tool to rebuild the BCD
Bootrec.exe is a command line tool that can be used to rebuild the BCD. The command line syntax is as follows: Bootrec.exe /rebuildbcd This will rebuild the BCD and fix startup repair error code 0x490.
4. Run a startup repair
- Boot your computer into Safe Mode with Networking.
- Use Windows Start Menu to search for ' Startup Repair '.
- Once Startup Repair is found, right-click on it and select ' Run as Administrator '.
- Click on the ' Repair your computer ' button.
- Follow the on-screen instructions.
- When the repair is complete, reboot your computer.
- If the startup repair did not fix the problem, try to boot your computer into Safe Mode with Command Prompt.
- Use the ' dir ' command to list all files in the current directory.
- Use the ' cd ' command to change the directory to the location of the file that is causing the problem.
- Use the ' dir /a ' command to list all files in the current directory and their sizes.
- Use the ' cd /d ' command to change the directory to the location of the file that is smaller than the other file.
- Use the ' icacls <filename> ' command to give the file the ' read only ' permission.
- Use the ' chmod <filename> ' command to give the file the ' read and write ' permission.
- Use the ' copy <filename> ' command to copy the file to the current directory.
Some users might also have success with the following opitons:
- Use the SFC /SCANNOW command to scan for and repair missing or corrupted system files.
- Use the DISM /ONLINE /CLEANUP-IMAGE /RESTOREHEALTH command to scan for and repair missing or corrupted system files.
- Run a virus scan.
- Run a malware scan.
- Use the System Restore tool to restore the system to a previous state.
- Reinstall Windows.