Re: McAfee Security not working on Window 8.1 preview.. Why?
software must be compatible to windows 8.1 .. else such issues can cause..
Keep in the mind, windows 8.1 is a preview and its a kind of "beta"
Macafee forum moderator/ Peacekeeper says
"it is possible that the beta version of mcafee might support 8.1 maybe when 8.1 in the beta release but Macfee products do normally not support betas and preview releases of windows. "
antivirus producers like macafe may release the software update in the future and that will fix this.. until you have to wait .. Until then you have to stay with defender in windows 8.1 or find a compatible antivirus solution for windows 8.1