I'm not sure what you mean by saying "add another layer" but it's not a good idea to have more than one running at the same time. They will usually interfere with one another. Some products search and identify the presence of competitors during the installation process and if another security program is found to be active, it gets disabled.

The Microsoft software isn't considered a top choice and I wouldn't recommend using it at all. See this link, from a long respected source (PCMag.com, the successor to PC Magazine, a top publication in the olden days of print media). This cover page has links to pages rating both free and not free antivirus products. Their ratings are objective and current.

Antivirus ratings

I'm currently using McAfee Live Safe and Malwarebyrtes Premium along with Malwarebytes Anti Exploit. However, if you're just browsing the internet and not performing any work, Webroot is a solid choice.

That's layered protection. I like the choices and like Webroot as well. Can you get some Anti Ransomeware or does your McAfee include it ? Some of the paid for Anti Virus programs are starting to include it now. Malwarebytes also has an Anti Ransomeware that may run with what you have.

https://www.microsoft.com/en-us/security/portal/mmpc/shared/ransomware.aspx#home

I also run third party firmware on my wifi router which includes a customized ad blocker and the ability to blacklist hundreds of websites so they that can't access my network.

Several years ago, I switched to "Norton", and have been satisfied with it.

I've used the free version of Avast! for the last 5 years, and it's kept me safe. Previously I used McAfee for quite a few years and the same with Norton/Symantec. However, I found that sometimes the Norton and McAfee have caused computer slowdowns at times; they are also difficult to completely remove, and cause continuing issues if you don't get them uninstalled properly and completely. I also keep Malwarebytes and Super Antispyware on my Desktop and occasionally run them just to do a doublecheck on the state of my computer.

Today, Norton and McAfee offer complete removal tools if you wish to uninstall the software. It's always best to use the proprietary removal tool when offered instead of the Windows uninstall feature.

I switched from Norton to Kaspersky and would not go back.

YMMV

kudzu, you might be surprised about performance changes that have been made. I'm a longtime satisfied Norton user but I know there are several other equally capable choices. Norton does its scans and other work when the PC is idle, and stops when someone starts to use it, so there's no effect on performance at all. The few times I've manually triggered a scan, it had a light touch and didn't overwhelm or interrupt normal use in any way. I'm sure this performance/activity approach is also used by other programs.

Brushworks is right, several of these programs have proprietary removal tools that are very comprehensive.

Elmer-

Good to know about the performance improvements. It is true that my comments are about using those products more than five years ago. I did know about the removal tools, but twice had problems even after using those.

Thank you everyone, I'm using win 7 on my laptop. I used to use malware bytes free but was no able to avoid the premium updates offers, it got to be a nusiance. Anyone use super antispyware, paid version?

As an IT professional I recommend Avast. I haven't looked at the charts really recently but a couple years ago when I was researching them for business settings Avast was rated most effective free malware handler and #2 overall (included paid softwares). Now these things change from year to year so keep that in mind but I'd say so far Avast is a good product.

Daniel-

Good to hear from a professional. I've yet to have anything get by Avast in the 5 years I've been using it on both of my home computers.