Know why PCs are usually cheaper than Macs? For one thing, because they come loaded with crapware that makes the offsets the PC manufacturer’s costs. Sometimes, that just makes your computer run slower. Sometimes, it exposes you to all manner of malicious intrusion.
If you have a Lenovo computer, here are Lenovo’s instructions for removing the horrible, security-risk crapware it irresponsibly installed on your computer before sending it to you. Then follow the instructions in this guide to actually take care of the problem because Lenovo’s instructions aren’t complete.
Update: You can also just update Windows Defender, which will take care of removing the Superfish software.