For those using Windows 7, it would be a good idea to install the out-of-band patch which was recently released by Microsoft to fix the hole MS created when the released the Meltdown vulnerability patch. Read the information below:

Windows kernel update for CVE-2018-1038
https://support.microsoft.com/en-us/help/4100480/windows-kernel-update-for-cve-2018-1038

Install Windows 7 KB4100480 to fix the bugs triggered by previous updates
https://windowsreport.com/kb4100480/

Microsoft Update Catalog Site for Manual Download of Patch
https://www.catalog.update.microsoft.com/Search.aspx?q=kb4100480

Hope this helps.

Grif