Dump McAffee and use Windows defender or Avast
I would even take Windows Defender over Avast. I used to recommend Avast, but in recent years, found it too bloated. Get Windows Defender for Windows 8.1/10, or Microsoft Security Essentials if you run Windows 7.
Make sure that you get McAfee off your system first, completely. To do this:
1.) Remove all McAfee products from Add/Remove Programs in Control Panel.
3.) Download and Run the McAfee Removal Tool to get any fragments of McAfee products off your system. This link provides instructions for that. Even though it says you should only use this tool if Add/Remove does not work, I would still run it, because the fragments left behind can interfere with other AV programs:
5,) Turn on Windows Defender by searching for it in Windows 8.1 to 10's search box, or Download Microsoft Security Essentials if you run Windows 7 from Microsoft's website.
6.) Make sure you have only one Anti-Virus on your system offering Real-Time Protection. More than one will cause slowdowns and conflicts.
McAfee is very bloated, and offers only average protection. If you don't have an Ad Blocker installed on your browsers, search for Ad Block Plus in each of your browsers and get that as well. This will block almost all banner ads on websites that can lead to malware, as well as ads on You Tube videos!
Will either Windows Defender or Avast work on Windows XP?
Yes according to this: (Avast will work.) Windows Defender will not work on Windows XP. Note that Windows XP is a no longer supported Microsoft Operating System. (See below after Avast 2016 requirements: )
Updates For Windows XP Ended in April 2014
Be aware that Windows Updates are just as important as anti-virus, at times even more so, because they are the protective root of the operating system. Microsoft no longer supports updates for Windows XP, and stopped providing updates for it and Outlook Express in April 2014. Thirteen years after XP's first launch. Computers have come down dramatically in price, and if you are still using Windows XP, you really should consider an upgrade to Windows 10 for better security, built in protection in Windows Defender, plus added safeguards to protect against ransomware attacks. You could pick up a good computer for about $500. (With Windows 10.)
Microsoft did provide an out of cycle update for the "Wanna Cry" ransomware because so many millions were affected on systems as old as Windows XP. Don't count on them doing that for older systems again. Update expiration dates for Windows Operating Systems are as follows:
Windows 7: Till January 2020
Windows 8.1: Till July 2023
Windows 10: (Regularly Updated For the life of the device on which it is used.) Microsoft wants everyone on Windows 10 and have it evolve over time with monthly security updates, and new update features 2-3 times a year.
If you download Avast, make sure you examine the URL carefully and that it is from Avast.com. If the URL says CNet.com or Cnet.net, there may be some adware bundled with the download.
Thanks. Looking to buy a laptop with Windows 10. It is time.
Get a good amout of RAM. This will make things go faster and smoother.
The other thing that I would recommend is to search for and get Ad Block Plus on each of your web-browsers. You can search for it within each browser on your computer. It will block so many of the banner ads that can lead to malware on websites, and will even block ads embedded in You Tube videos.
Many laptops priced on the low end will come with trial versions of anti-virus like McAfee or Norton (Symantic.) If I were you I would just use Windows Defender, and uninstall the other Anti-Virus programs that may come with it through Add/Remove Programs in Control Panel. You should reboot after uninstalling those programs. Than type in Windows Defender into the Cortana Search box on the left side of the taskbar. Click on it Follow the prompts to activate the program and you should be all set! Set up for Windows Dedender is easy and self-explanatory.