This generally happens when you have dual boot your windows with any of Linux distribution like Ubuntu / Linux Mint etc. and then you decide to run only one OS i.e windows and you deleted the Linux partition.
While deleting the partition of Linux from from your OS installed drive, you have accidentally actually deleted the Boot Loader which is responsible for handling the boot request at the time of windows booting/start.
Recovering from it is not a great deal, you just need a bootable USB of your windows to recover from GRUB rescue mode.
You can make bootable USB using the rufus.exe application or other USB booting software, available freely online for windows and just select your windows ISO file and the USB drive for making it bootable using the application.
Once you had it just follow below steps:-
Assuming you are using Windows 7 (this should also work on Vista and Windows 8):
Bootrec.exe /FixMbrand then press ENTER. You will see “operation completed successfully.” (Doesn’t even take a second. Don’t be alarmed )
GRUB will be overwritten in step 7 and Windows bootloader will once again take control of loading your OS(s).
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