Why not just do a clean wipe using Microsoft's installer? It's a good way to revisit the software that you use and how it's set up to make sure it's still the best combination for you. Do you think Lenovo is compromising their computers at the hardware level?
If they're ok preinstalling malware then I doubt they'll have any issues tampering with the hardware. Either way I can't buy anything from Lenovo anymore out of principle; I simply don't trust them now.