If you encounter this issue, first search online on how to add an antivirus exception/exclusion for a file. Add Growtopia's installer, reinstall Growtopia and add (type this into the File Name box when selecting a file, and it is recommended that you copy and paste it in) "%programfiles%\Growtopia\Growtopia.exe" (without quotes). If you get an error, try this instead: %programfiles(x86)%\Growtopia\Growtopia.exe