Constant threat alert from Avast

So my computer seems to be infected. Every time I start my computer avast alerts me of a threat, well about 22 threats!!
When I open avast, it says that no further action is needed, but the problem keeps happening, every single time I start my laptop.
What can I do? how can I clean it or delete infected files?
The process running everytime is called svchost.exe, and I don’t know what to do because when I try ton research about it it doesn’t seem to be a bad thing??
Thank you in advance for helping me solve this

Hello,

Please follow this topic and attach required reports

https://forum.avast.com/index.php?topic=53253.0