networking two vista pc s

HI all I have Vista on 2 pc`s 1 is AMD 2600 and other P4 3.4ghz. The problem I have i they connect on the network I can see User and Public etc. I can`t put files from one to the other even though all the settings for sharing are set to allow anyone to add, change etc. I just get warnings saying I can`t. I can transfer to an XP laptop. Any ideas?? Cheers Steve