The Windows Update tackles Meltdown, but you will most likely need a BIOS update for Spectre. You can check if your system is vulnerable using this method:
Press the Windows key and type PowerShell.
Right click the PowerShell shortcut and select Run as Administrator.
Type Install-Module SpeculationControl and press Enter.
If you are prompted to install the NuGet provider, type Y and press Enter, and repeat if you are warned about installing from an untrusted repository.
With the installation complete, type Import-Module SpeculationControl and press Enter.
Type Get-SpeculationControlSettings and press Enter.
If all is green you are okay (like so), if things show up red you're not protected.
姐係BIOS 係多舊魚 Spectre 冇野唔使理佢