You need anti-malware programs installed if you want this to stay away. Running programs only once you have found something will not prevent it from coming back, nor is that a good idea by any means. (You should always have anti-malware programs running on your computer with real-time monitoring). Malware can also come in different variants that "one time fix" programs and instructions can't always help with. Some programs will also install the malware in multiple locations, or in different ways, so as to prevent its removal.
As for the issue at hand, what OS do you have?