Yes and no. Anti-virus vendors are updating their products to look out for viruses that utilize Meltdown and Spectre exploits. So if you have an anti-virus—Windows's built in Windows Defender counts—that is updated, you can feel a little easier knowing that your PC is safer, for now.
However, an anti-virus is just local protection. Meltdown and Spectre does the most damage to large scale company's that provide services that you might use every day: banks, streaming services, e-commerce, gaming, etc. If that sounds like everything to you, it is. Microsoft, Google, Amazon and others are rushing to implement fixes for Meltdown, but Spectre is going to take a bit more analysis.
The best thing to do right now is make sure Windows is updated. Google also stated that it would release a new version of Chrome on January 23 that blocks against Meltdown. Intel is working on patching its CPU lineup through microcode updates that you will probably see from your motherboard vendor.