Tring to set-up Network Config Generator

Hi I am trying to set-up Network Config Generator  I have placed the IP address in the box , but I do not know what to do with community string. I have downloaded this NCG to speed up my internet. I have Windows 7 home edition. After trying to run by pressing next I get this message " Device inventory failed.Please check the target device and community string fields are valid . I am not an IT specialist but I know my way around computers and Windows OS. I am dealing with my own laptop Toshiba Satellite 660

Even if you could point me in the direction of the correct articles within the community I would be grateful