Hello, this is Emily.
Any chance your computer didn't meet Windows 11 requirement on the hardware side, and you bypassed them to install? That will definitely lead to performance issue.
Unfortunaely you won't be able to simply go back. At this point, you will have to perform a clean install. I wouldn't recommend Windows 7 at all snce that OS hasn't been supported for some years, so a lot of modem apps won't run anymore on Windows 7, and there's no security support either.
To perform a clean installation of Windows 10 using the Windows Media Creation Tool.
The following steps should be done on a working Windows computer:
Download the Windows Media Creation Tool from Microsoft's official website. https://www.microsoft.com/software-download/win...
Run the tool and select "Create installation media for another PC."
Choose your language, edition, and architecture (32 or 64-bit) and select "Next."
Choose "USB flash drive" as the media to use for the installation and select "Next."
Connect a USB flash drive with at least 8 GB of free space to your computer.
Select the USB flash drive you want to use, and then select "Next."
The tool will then download the required files and create the installation media.
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Now these steps will be done on your problematic computer:
Go to the computer's BIOS boot menu to have it boot from the USB drive.
Follow the on-screen instructions to install Windows 10, making sure to choose "Custom install" and select the option to delete all existing partitions.
Once the installation is complete, you'll have a clean installation of Windows 10 on your computer.