When installing an antivirus solution, its files are typically integrated within many areas of the PC so as to ensure an efficient anti-malware protection.
This is why, after uninstalling such a security tool, there are numerous leftover files that might cause incompatibility errors if a new antivirus is set up.
To make sure this situation does not occur, it is best to remove antivirus solutions using dedicated applications - since they are released by the same company, these specialized uninstallers are more effective in detecting and cleaning any traces.
Another advantage of these utilities is that they can remove a wide range of products, such as Internet security suites, firewalls or antivirus tools, leaving the host PC free of any trace. A restart is often required to complete the uninstalling.