Taw, your contribution is lame. The early days of DOS would be the 1950s, on IBM mainframes, and that was before there were any known viruses. I also don't think the bit about languages that viruses are written in is very useful; at best it's an overgeneralization. However, instead of just deleting your text, like you do to other people, I'll leave it up to you to fix your own text. Have a nice day, and remember, Wikipedia is a community. GregLindahl