Hi CindylemSparks,
Welcome to the Forums!

Sounds like your issue is very similar to this:
https://www.lemmingsforums.net/index.php?topic=5569.msg91821#msg91821Don't worry, Neolemmix is perfectly safe, your antiviruses are incorrectly flagging it as malicious. I don't use the Malwarebytes browser, but I do have Malwarebytes as my main AV. In your case, try opening up MWB and adding NL to the allowed list. It should work without issues after that. The interesting thing is that I could had sworn I didn't need to do that in earlier versions of NL, but it's on the allowed list now and has been for some time. Even more, I would just pick one AV as your main one and disable the other one. Sometimes, problems can arise when you have multiple AV enabled on your system.
If you still require assistance, just post again and let us know! Enjoy your stay and welcome again