If you have removed Ubuntu from your computer and now want to boot Windows, there are a few things you need to do. First, make sure that the Windows partition is set as the active partition. To do this, open the Disk Management tool by pressing ⊞ Win+R and typing diskmgmt.msc. Right-click on your Windows partition and select Mark Partition as Active. Next, you need to change the boot order in BIOS so that your computer will boot from the Windows partition first. To do this, reboot your computer and press the key that opens BIOS (usually F2 or DEL). Navigate to the Boot tab and use the arrow keys to move the Windows partition up to the top of the list. Save your changes and exit BIOS. Your computer should now boot into Windows!