Buying new computer - how do you wipe it clean of all installed software?

[Paula Sims]

Hi there,
In the past I have built my own machines but due to recent events in my life have been forced to buy a new one. My current desktop is 10 years old and has seen better days.

That said, I can get a good deal on a Core 7 with 4 SS drives, 32G ram, and other fun stuff. But it will come with all the software I don't need. I can get a legit copy of Windows 10 OEM but can I use that to just wipe everything out and start again?

I've done it before but it was with new, out of the box, drives. Buying this stuff is new to me.

Thanks for your help.

Paula