Greetings, and welcome to the forum!
It looks like you've been infected with a rootkit.
Information from PrevX.
Note that the legit Windows-file is named
svchost.exe and
NOT system32:svchost.exe!
You should block everything related to system32:svchost.exe.
Do a scan with
Avira AntiVir. It scans for malware, and also for rootkit.
Rootkits hide themselves in other files, so it's hidden in svchost.exe. As it's a safe file, it's already in the safe list, and therefore it can't be submitted.
Cheers,
Ragwing