Got Windows disk? Or getting Windows file for usb by download. When you install it will wipe your disk. Linux will disappear - and all your apps and data. So back up your data.
Boot into bios and make your dvd or usb the primary boot drive. Put your disk/usb in and power off. Power up and Windows installation will start. Follow the prompts. When finished remove disk/usb then power off. Power up into bios. Make your hard drive the primary boot drive again.
Reinstall drivers and apps and copy data back.