[ossiblue]

Well, like many others I had to get a new computer due to the loss of support for XP by microsoft. After a bit of research, I found a laptop running Windows 7 instead of Windows 8 or 8.1 and bought it. I've been very careful on visiting websites even though the new computer came with Norton installed. I installed Firefox and never use IE.

Recently, I began getting infected with Popups. Ran a Norton scan, which found a few infections, but they persisted. Installed Malwarebytes, and cleaned it all out. Two days later, they reappeared. Ran another scan (MB) found fewer infections, checked the "add-ons" in Firefox and found the malicious items.

Today, while perusing PP, I get a warning from Malware that a program is trying to load in my computer. I check add-ons and discover a new item that was just added, so I remove it. Check my quarantine file an see Malware has removed a PUP virus. All is good.

Here's my point. With XP, I used Firefox and Avast (free version) and never had any problems like this. Now, with Windows 7, I have much more active security and I still get infections. My assumption is, the infections are focusing on the newer operating systems because that is what everyone on a PC needs to be using. What a pain.

I cannot tell from where the virus are coming. The last one happened when reading a thread here on PP. The only thing was I had a streaming radio station running at the same time. Is this a source of infection? It's to a point to where when my free security programs expire, I will buy a subscription to one as I don't think free Avast will suffice.
Any ideas on the cause of the infections and the best anti-virus software would be appreciated.