1. Update your Windows PC.
Patching up your PC against "Meltdown" and "Spectre" will involve updating Windows 10.
It's possible that Windows' update feature already automatically downloaded and installed the patch, but you may need to restart your computer to finalize the patch.
Either way, you'd do well to check whether any updates are available for your PC. In Windows 10, click the search bar on the bottom left > type "Update" > click "Check for Updates > click "Check for updates" again the the Windows Update menu.
If Windows is showing that it's already downloaded the update, follow the prompts on the screen. It could tell you to install or restart your computer.
If you're using a third-party anti-virus program, you may not be able to install the patch yet.
The bug involves the same sensitive PC parts that anti-virus programs monitor for unusual or malicious activities. As a result, Microsoft's patch may not be compatible with your third-party anti-virus program. If that's the case, you'll have to wait for your anti-virus vendor to release its own update before Microsoft's update becomes available.
I wouldn't disable your anti-virus program so you can download Microsoft's update, as it may not be compatible with the update when you turn the anti-virus program back on.
I myself haven't been able to download Microsoft's update as I'm using a third-party anti-virus program called "Webroot," which hasn't been updated yet.
2. Download any other updates from your PC's manufacturer.
Apart from the Windows operating system, the Intel chips inside your computer will also need to be updated with new firmware. For chip updates, you'll need to download and install updates that come directly from the manufacturer of your PC.
Manufacturer updates will come in Microsoft's Windows Update feature. If you're unsure about how to install their updates, your best bet is to contact your PC's manufacturer.
Those who assembled their own PCs will have to search for updates for their chips on Intel's website. AMD users can find information and updates from AMD's website.
3. Make sure your web browser gets updates.
Web browsers would play a big role for attackers looking to exploit the recent chip bug, and browser developers are issuing updates.
Mozilla, the company behind the Firefox web browser, has begun rolling out updates, as well as Microsoft for its Internet Explorer and Edge browsers. Google is including a patch for the bug in its upcoming update that will roll out on January 23. Apple plans on rolling out an update soon for its Safari web browser.
Some may have browser updates enabled automatically, but those updates may require you to close and re-open your browser. Check your browser's settings to see if it's up to date and whether you need to restart your browser.
Apple computers have already been partially updated, and more updates will be released over time.
Apple already began protecting its computers and users against the potentially harrowing effects of "Meltdown" with updates through the Mac App Store. Be on the lookout for additional updates from Apple for fixes against the "Spectre" bug.