User blog: Armando Rodrigues
The real risk of installing more than one antivirus program is that they don't work well together, and can cause slow system performance and computer lock-ups and such. you should only pick one antivirus product and install it. Microsoft Windows comes with a limited program called "Windows Defender" that protects against spyware/adware but not viruses, but if you prefer a Microsoft solution you can download and install "Microsoft Security Essentials" that provides more protection. Personally, I both use and recommend MSE and have never had a problem with it.
Be sure you uninstall both Webroot and Norton Internet Security before installing MSE.
First of all there are some differences between the two security software packages.
Webroot Anti-Virus with Spy Sweeper is an overall security package with more of a leaning towards malware/spyware protection, whereas Norton provides more security from viruses than malware.
Many people here have given some advice relating to Microsoft Security Essentials, and this running in combination with a malware scanning product can be of great help to you, as Microsoft Security Essentials is quite a light program; it does exactly what it says without bogging your computer down with too much security, causing your system to slow down to a crawl.
If you want to download Microsoft Security Essentials, please make sure you only get it from a trusted source, as there are many copycats of this software available which attempt charge people to use it:
Microsoft Security Essentials will always remain free of charge.
While I am not saying Norton isn't the product for you, I would have to say that overall you are more likely to suffer from malware issues over viruses; viruses are destructive with intent to disrupt, while malware has a pure monetry intent, duping their victims into buying fake anti-virus products to scam them of their money.
You do have the option to install one of these as a trial along with free malware scanning software, such as Malwarebytes, to see how this pans out for you, although as stated above it is never a good idea to have two [anti-virus] packages running at once. One malware scanning package and one antivirus package running together should work fine for you.
Included within Windows 7 is something known as "Windows Defender". You may have heard about this from the posters above; while this provides protection from some mainstream threats, it is always a good idea to have a dedicated software package that you can use periodically to scan your machine (say, once every few weeks).
I can assure you that Norton is a very popular program that many people use, so please don't be too frightened in downloading it. I will provide a link for you below do you can download or renew and reinstall norton with product key, so you can at least keep this as a tool in your inventory incase something goes horribly wrong after visiting a page and becoming infected:
The main thing to remember is just to be a little careful when you access some sites. Quite often you will be happily browsing the Internet and you might get a popup with a Windows-style window telling you are infected with trojans and goodness knows what else. These are false threats, aimed at trying to trick you to download something which will then give you pestering popups asking you to buy said fake anti-virus packages.
If you ever visit a website that pops up with something saying you are infected, please try all you can to close the window. They can be a little persistant but with some patience it'll be gone and you will [most likely] never see it again. If you are prompted to download a file (either run, save or cancel), especially after seeing one of these popups, please click cancel. That way those threats will only stay threats, and as a result your machine will stay relatively clean.
If you do become infected with malware asking you to buy software, don't panic! These things are easliy removed, and there are plenty of people willing to give you help.