That is definitely one of the risks. Since autotypers and bots are forbidden by RuneScape and are in general unethical, the sites that offer these programs are not very trustworthy. Jagex - the company that makes RuneScape - claims that it has analyzed some of the bot programs and that most of them will somehow infect your computer.
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try using 'gary's hood' auto typer/clicker. it is commonly used because it is easy to use but does the job ;)
Download a bot. on such bot is available at: http://mygeek247.wordpress.com/runescape-auto-typer/
You can get it by clicking on this link: http://www.garyshood.com/rsclient/ click on the lower screen and click "auto typer & auto clicker, and download. you dont gotta save it so choose no if you want. Click on the small box and choose either auto typer or autoclicker.
There is no "best" auto for runescape. They are all illegal (in the real world) and are against the rules.
Yes