I was pretty sure that if someone logged into your 3Dice account it had to have been from your own computer. Even if a keylogger was used to record your password the person who used it would have to have your account number too. I don't think most people retype that every time they log in.
I agree with Enzo, the best thing is to change your windows password and shut your computer off when you're not around. That way people can't be mucking around with it when you're gone.
Now on a side note if there is a hacker out there attempting to make deposits into other people's accounts let me know. I'll take all the help I can get.
I have my auto-complete on, my account # shows up but my password does not.
Seems there are only a few possibilities here. Hacked via wireless, someone at home logged in, trojan or keylogger was used or the op isn't being upfront. The other thing I'm curious about is how did the OP find out about this, since there weren't any actual deposits made and I'm assuming that an OKPay account wasn't even created because Enzo said the page was just clicked around on.