There is always the option to just use Windows 8/10 Defender which includes anti-virus and anti-malware protection. Windows 8/10 Defender provides the same level of protection against malware as Microsoft Security Essentials (MSE) provides on older operation systems (and probably easier to use for the novice)...read Is Windows Defender Good Enough.
Since Windows 8/10 Defender includes anti-virus protection, it typically is disabled by the installation of a third-party anti-virus program. If a trial anti-virus (i.e. McAfee, Norton, Webroot, etc) came preinstalled on your computer or you installed one, Windows Defender will be turned off (disabled). Windows Defender recognizes the install and automatically disables itself when other anti-virus products are used to avoid conflicts. Windows 8/10 Defender will remain disabled until that anti-virus software has been completely uninstalled. In your case, that means removing Webroot, rebooting and allowing Windows Defender to start it's protection.
Although Windows 8/10 Defender provides some anti-malware protection...it is weak, meaning it does not provide comprehensive protection and cannot prevent, detect and remove all threats at any given time. This is true for most anti-virus solutions. Anti-virus and anti-malware programs each perform different tasks as it relates to computer security and threat detection. Essentially, they look for and remove different types of malicious threats.
In simplistic terms, Anti-virus programs generally scan for infectious malware which includes viruses, worms, Trojans, rootkis and bots.
Anti-malware programs generally tend to focus more on adware, spyware, unwanted toolbars, browser hijackers, potentially unwanted programs and potentially unsafe applications.
Anti-virus and Anti-malware solutions with anti-exploitation features protect against zero-day malware, drive-by downloads, exploits and Exploit Kits.
Therefore, you need both an anti-virus and an anti-malware solution for maximum protection.
Please read Supplementing your Anti-Virus Program with Anti-Malware Tools for information about trustworthy and effective anti-malware programs.
For other suggestions if you do not want to use WIndows Defender see Choosing an Anti-Virus Program.
In regards to Firewalls, just use Windows built-in Firewall. It will protect you as well as any paid for products without having to learn how to use and configure advanced settings. Windows Firewall runs in the background and provides automatic protection without the user having to do anything.