First and very important is to please dont confuse yourself and learn that in cryptocurrency mining  we use hashrate which is written in short as KH/s, MH/s, GH/s, TH/s etc
This equals to Kilo (1000) Mega (million) Tera (trillion) for example L3+ 500MH/s is 0.5 TH/s
You  wrote Mhz (MHz)which is standing for Megahertz and is for radio frequency not mining hashrate speed description - please remember  

Best for you will be to join busy pool where most blocks are solved so this way you will get your little share constantly from each block found in this pool otherwise you probably never be able to find a block mining solo.
From screenshot below you can see approximately SAGA rewards accordingly to users hashrate (top 15) which lowest there is 589.4 MH/s and ~23.4 saga/day so do your own math.
http://s1.altcoinix.com/saga/public/index.php?page=statistics&action=pool




Of corse we notice and this is kind of normal that some wallets showing false positive detections as user above mentioned already.
 All what you need is add that to your antivirus whitelist and all will be fine, dont worry