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@tansy Hmm, a couple of theories:

• Did you set it up to dual-boot? Do you see a menu at the start when you restart the computer?
• Was it a live USB stick (was the OS running from the USB stick?)

PS. This might help: https://www.reddit.com/r/linux4noobs/comments/u8tews/ubuntu_install_went_well_but_when_the_computer/

(Worst case scenario, if there’s no data you want to keep, reinstalling won’t harm anything but it’s probably just a boot menu priority issue. If you want to remove Windows entirely, you’ll have to tell the installer to wipe the drive and make a single partition while installing.)