get files/data from my PC with my mini-PC.. how?

it's been quite a while since i did this, and i dunno how i do this anymore...

i want to get files from my stationary pc with my mini-PC, but i dunno how i do this. both pc's got WinXP. i've shared all the files i want to put into my mini-PC. i've added both to the same network. but when i search for the pc's, i cannot find either of them (i can't find my stationary on my mini-pc and vise versa)...

how do i do this? i don't remember anymore.

thanks in advance!