Any network computer acess programs?

Hey there. Im looking for an alternative program to Tight VNC. I use this on my home network to acess other computers from mine so I ca install software and help them with problems without having to manually go over to there. Right now Vnc is only working one way- that is it is letting me get to my computer from any other computer, but i cannot get to other computers from mine :S

Anyone know of any alternatives (free)?

I would appreciate it :stuck_out_tongue: