Jono - 2020-09-06

By running DBAN you removed all data on the drive including the OS (Windows), softwware and your files. Everything was deleted. You will need to re-install an operating system to use the laptop.

This link might help you get the recovery install media from Lenovo for that model. After getting theses and installing your laptop should have everything like when it came out of the box new.
https://support.lenovo.com/us/en/solutions/ht035659