How can you verify if your PC is infection free?

Answer 1

Using a virus scanner alone does n't guarantee you as immune, because antivirus detects only the symptoms not the underlying causes. Apart from your anti-virus you need to monitor your system activities, especially when you are connected with internet. Try to monitor your network using netstat or other DNS tools, and identify what ports are open and what functions it is doing. The normal system should have 5 TCP connections and 10 UDP connections.

Answer 2

Their are many ways to check for viruses one main one being download a virus software which will do a whole computer scan and find any type of malware or any other viruses for a free trial of round about 30 days. Id suggest using AVG Virus protection and Avast Virus protection and pay for a monthly or yearly subscription to stop any type of viruses being hidden in files.