If you had 2 OS’s in your system, one Linux and another Windows then you may have got GRUB bootloader installed for multi-booting which gives you the option to select your desired OS for starting your PC. But if you want to remove Linux from your system then sometimes you may have experienced after deleting Linux partitions GRUB may experience errors and may prevent your system to start normally to Windows OS. To fix this issue you can follow below steps and you may notice afterwards that your system boots to Windows without any hiccups.
Insert your Windows install disc/USB bootable Windows.
Press any key at the “Press any key to boot from CD or DVD” message to boot from the disc/drive.
Choose repair your computer after you select the language, time and keyboard method (for Windows 7 users)
Select your Windows installation drive (usually C:\)
Click Next
Select Command Prompt in the System Recovery Options window.
Write the following commands in the Command Prompt: