delete after

-- ... (existing code)

local function activateUser(username)
    term.clear()
    term.setCursorPos(1, 1)

    print("Are you sure you want to activate user " .. username .. "? (yes/no)")
    local confirmation = read()

    if confirmation:lower() == "yes" then
        local disabledFile = fs.combine(USERS_FOLDER .. username, "disabled.txt")

        if fs.exists(disabledFile) then
            fs.delete(disabledFile)
            print("User activated successfully.")
        else
            print("User is already active.")
        end
    else
        print("User activation canceled.")
    end
end

local function main()
    local users = fs.list(USERS_FOLDER)

    if not users or #users == 0 then
        -- No users detected, run the BSOD program
        shell.run(ERROR_FOLDER .. BSOD_PROGRAM)
    else
        term.clear()
        term.setCursorPos(1, 1)

        print("Enter username:")
        local enteredUsername = read()

        if checkCredentials(enteredUsername) then
            activateUser(enteredUsername)  -- New line to activate the user
            print("Access granted. Welcome, " .. enteredUsername .. "!")
            -- Your main OS code goes here
        else
            print("Access denied.")
        end
    end
end

main()