Windows 7 network problems

Hi

I hope I can get some help here. I don't want to sound stupid but I have just installed two win7 home computers and set up the home network, All seems fine untill I try to transfer files from computer a to b and the message says I need the administrators permission. Now i can transfer from b to a with no problems. I have dissabled all passwords and enabled all file sharing and all is visible within the network but still only one way traffic, both users are administrators. this has me a little flumoxed as I was just starting to think microsoft had resolved the XP problems.
If anyone has a fix I would be very greatfull
 
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