windows 8 is secure enough with Windows Firewall and Wndows Defender (which is built into the OS).
Third party apps are no longer needed, especially ones that are as buggy and unstable as VMS
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We have no further updates on this as of yet however as Gary_Dexter has said Windows 8 has Firewall and Defender built in. These are sufficient but should you wish to have a third party software then there are a number of free and paid versions available such as Avast, AVG, Kaspersky, Norton, Mcafee, to name just a few