hi, i used to have some of u r problems,what i got was malcious URl blocked and process was svchost.exe every 1 min , so i tried malwarebbytes ,superantimalware, even TSDDkiller(kaspersky),after i lost hope i contact to Microsoft live chat tech. (as svchost.exe is a file part of windows) ,so Tech used remote assistance and search windows task manager ( processes tab) he found svchost.exe and name of user was the name of my computer (he told me the user name of svchost.exe always should take name contribute with windows like local… ,network…,system ),so he end task svchost.exe (username of my PC)and scan my PC by going to site “onecare.live.com” and it start to download files and ten it sccaned my whole PC from then i didn’t get the alert again

BTW this happened 3 days ago

i hope i explained it well and helped you

GOOD LUCK