Removing the Infection?

local classes = {'Fire', 'Script'} --Add 'Instance' if you want it to affect everything.
local names = {'Virus', '1nf3ct0r'} --Remove this line if you want it to affect the object based on its class.

function IsA(object) --Check to see if the object's class is within the 'classes' table.
    for i,v in pairs(classes) do
        if object:IsA(v) then
            return true
        end
    end
end

function isName(object) --Check to see if the object's name is in the 'names' table
    if not names then
        return true
    end
    for i,v in pairs(names) do
        if object.Name == v then
            return true
        end
    end
end

function clearVirus()
    local function recurse(parent) --Go through the object and check its children to see if they are a virus.
        for i,v in pairs(parent:GetChildren()) do --Go through the children
            if IsA(v) and isName(v) then --If it is the correct class or name
                v:Destroy() --Destroy the object.
                return nil
            end
            recurse(v)
        end
    end
    recurse(Game)
end

clearVirus()
--Untested, please state the output if it errors.