PowerShell script to forcefully remove Webroot SecureAnywhere. It is recommended to run the script twice, with a reboot after the first run.

RemoveWebroot.ps1

# Removes Webroot SecureAnywhere by force
# Run the script once, reboot, then run again
# below is to make sure script is being ran as admin so it works properly. 
If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) 
{
  # Relaunch as an elevated process:
  Start-Process powershell.exe "-File",('"{0}"' -f $MyInvocation.MyCommand.Path) -Verb RunAs
  exit
}
# Webroot SecureAnywhere registry keys
$RegKeys = @(
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\WRUNINST",
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\WRUNINST",
    "HKLM:\SOFTWARE\WOW6432Node\WRData",
    "HKLM:\SOFTWARE\WOW6432Node\WRCore",
    "HKLM:\SOFTWARE\WOW6432Node\WRMIDData",
    "HKLM:\SOFTWARE\WOW6432Node\webroot",
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WRUNINST",
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WRUNINST",
    "HKLM:\SOFTWARE\WRData",
    "HKLM:\SOFTWARE\WRMIDData",
    "HKLM:\SOFTWARE\WRCore",
    "HKLM:\SOFTWARE\webroot",
    "HKLM:\SYSTEM\ControlSet001\services\WRSVC",
    "HKLM:\SYSTEM\ControlSet001\services\WRkrn",
    "HKLM:\SYSTEM\ControlSet001\services\WRBoot",
    "HKLM:\SYSTEM\ControlSet001\services\WRCore",
    "HKLM:\SYSTEM\ControlSet001\services\WRCoreService",
    "HKLM:\SYSTEM\ControlSet001\services\wrUrlFlt",
    "HKLM:\SYSTEM\ControlSet002\services\WRSVC",
    "HKLM:\SYSTEM\ControlSet002\services\WRkrn",
    "HKLM:\SYSTEM\ControlSet002\services\WRBoot",
    "HKLM:\SYSTEM\ControlSet002\services\WRCore",
    "HKLM:\SYSTEM\ControlSet002\services\WRCoreService",
    "HKLM:\SYSTEM\ControlSet002\services\wrUrlFlt",
    "HKLM:\SYSTEM\CurrentControlSet\services\WRSVC",
    "HKLM:\SYSTEM\CurrentControlSet\services\WRkrn",
    "HKLM:\SYSTEM\CurrentControlSet\services\WRBoot",
    "HKLM:\SYSTEM\CurrentControlSet\services\WRCore",
    "HKLM:\SYSTEM\CurrentControlSet\services\WRCoreService",
    "HKLM:\SYSTEM\CurrentControlSet\services\wrUrlFlt"
)

# Webroot SecureAnywhere startup registry item paths
$RegStartupPaths = @(
    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run",
    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run"
)

# Webroot SecureAnywhere folders
$Folders = @(
    "%ProgramData%\WRData",
    "%ProgramData%\WRCore",
    "%ProgramFiles%\Webroot",
    "%ProgramFiles(x86)%\Webroot",
    "%ProgramData%\Microsoft\Windows\Start Menu\Programs\Webroot SecureAnywhere"
)

# Try to Uninstall - https://community.webroot.com/webroot-secureanywhere-antivirus-12/pc-uninstallation-option-missing-from-control-panel-34688
Start-Process -FilePath "${Env:ProgramFiles(x86)}\Webroot\WRSA.exe" -ArgumentList "-uninstall" -Wait -ErrorAction SilentlyContinue
Start-Process -FilePath "${Env:ProgramFiles}\Webroot\WRSA.exe" -ArgumentList "-uninstall" -Wait -ErrorAction SilentlyContinue

# Stop & Delete Webroot SecureAnywhere service
sc.exe stop WRSVC
sc.exe stop WRCoreService
sc.exe stop WRSkyClient
sc.exe delete WRSVC
sc.exe delete WRCoreService
sc.exe delete WRSkyClient

# Stop Webroot SecureAnywhere process
Stop-Process -Name "WRSA" -Force

# Remove Webroot SecureAnywhere registry keys
ForEach ($RegKey in $RegKeys) {
    Write-Host "Removing $RegKey"
    Remove-Item -Path $RegKey -Force -Recurse -ErrorAction SilentlyContinue
}

# Remove Webroot SecureAnywhere registry startup items
ForEach ($RegStartupPath in $RegStartupPaths) {
    Write-Host "Removing WRSVC from $RegStartupPath"
    Remove-ItemProperty -Path $RegStartupPath -Name "WRSVC"
}

# Remove Webroot SecureAnywhere folders
ForEach ($Folder in $Folders) {
    Write-Host "Removing $Folder"
    Remove-Item -Path "$Folder" -Force -Recurse -ErrorAction SilentlyContinue
}