Let's google for it...
[link|http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=atdem|http://www.google.co...&oe=UTF-8&q=atdem]
Nope. I don't know about this program, and it looks like nobody else does as well.
If programs that nobody, including you, has heard of are running, then that sounds like something homegrown is running. (Even if it is obscure on your computer, I expect to see it show up in Google.) If something homegrown is running and you don't know about it, then I would start looking around for trojans - evidence that some script kiddie managed to 0wn j00.
If that is the case then your memory problems may be something that that kid is doing...
Sorry to raise this possibility,
Ben