Welcome Abhishek Singh,
Thank you for reaching out to Microsoft Q&A forum.
This usually means the System Reserved Partition (SRP) does not have enough free space for the upgrade process.
Before suggesting more advanced fixes, could you please confirm:
- Is Windows 10 currently starting and working normally?
- Open Disk Management (press Windows + X > Disk Management) and tell us:
- How large is the System Reserved partition (typically 100 MB, 350 MB, 500 MB, etc.)?
- Is your drive using MBR or GPT partition style?
- How large is the System Reserved partition (typically 100 MB, 350 MB, 500 MB, etc.)?
In the meantime, please try these quick checks:
- Open Settings > Windows Update and install all available Windows 10 updates.
- Disconnect any external storage devices (USB drives, memory cards, external hard drives).
- Run Disk Cleanup:
- Search for Disk Cleanup
- Select drive C:
- Check Temporary files and Windows Update Cleanup
- Click OK
- Restart the PC and try the Windows 11 upgrade again.
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