Lenovo recovery USB problem, can't reinstall windows?

[mafia]

I have a Lenovo ThinkPad T420. The OS is corrupt and I have very limited usage with it (very slow and soggy, however Ubuntu works flawlessly on a separate partition). In Windows, Lenovo has a separate partition for recovery. You click on it in My Computer and a Recovery Disk configurator opens up. I used a USB flash drive for my recovery disk. However, when I booted my laptop to run the USB drive it didn't work. I researched the issue and found that I'm supposed to enable the drive to be bootable but that requires format. I inserted a different flash drive, formatted it and made it bootable. Opened the recovery disk creator and received a error saying "You can only have one copy of Windows. Program will now close". My laptop was bought in 2012 so it is out of warranty and now I don't think I can reinstall windows. Any help on this would be appreciated. Sorry for any grammar or spelling errors as I'm using my TouchPad to type this.

Thanks

 

[master_shake_]

use your coa to download an iso from microsoft.

https://www.microsoft.com/en-ca/software-download/home

then use this to put in o na a usb drive

https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool

 

[mafia]

use your coa to download an iso from microsoft.

https://www.microsoft.com/en-ca/software-download/home

then use this to put in o na a usb drive

https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool

I'm assuming this wouldn't have all the Lenovo drivers?