Thank you.
Do you mean that svchost is not infected - rather the popup was just warning about something the browser wanted to show me? Do I need to do anything further? Is there any way to stop the computer from attempting to access this adware?
When in doubt you can ask for a qualified malware removal specialist (who is monitoring this thread now) to look at the log txts you can attach in a following posting in this thread, see how here: https://forum.avast.com/index.php?topic=53253.0
When eventually cleansed or already clean your best form of protection is to install a decent adblocker extension like uBlock for instance. Also add this extra list for greyware there: http://malwareurls.joxeankoret.com/grayarea.txt (list version updated every day). Know that Google Chrome is in some way compromised at the moment, so look for another second browser to use.