Radmin 3 Windows Permissions

Hey all

I'm using Radmin 3 to show a slideshow in the office. I basically use it to go onto another computer and set the slideshow up. The problem is that I'm trying to get Windows Permissions to work so that I don't have to enter a password every time I update the slideshow (as I do this about 5 times a day). However, when I go to set the permissions, the program only recognises the local machine - not the domain it's connected to. In order for me to connect, I need it to search the domain for my username so that I'm allowed to connect without a password.

Does anyone have any idea why this particular machine just doesn't allow me to search the domain for my username? It's a Windows XP machine and I've never had this problem before (although I've only used Windows 7 with Radmin 3 before).