Slow Transfer Speed Over Network

Here is my problem. In this case, I am trying to transfer pictures from one of my XP systems to my Windows 7 Home Premium system over my wired network. Between the XP systems, things run fairly quick. But not with 7 involved. When I go to transfer the 47 pictures that I want, it tells me that it will take 18 minutes. And this is for only 66.7MB of data. Tell me this can get better. Being new to 7, I have no idea where to look for the problem. I tried searching Microsoft's site and the help files on my system. I just can't find a solution.

Here is some more info, and maybe some you don't need. On the Windows 7 system, I can access all the shared folders on my other systems (all XP SP3). If I go to the network map, my other systems are marked as "The following discovered devices can not be placed in the map.". I don't know if that is a problem or not. The reason I did that is because I was reading through the Microsoft site on file sharing and that was mentioned. It also mentions a program called LLTD, which may be needed on 32-bit XP systems. I tried installing that on my XP system, but it said I didn't need it.

As far as the file transfer, while sitting at my XP system, access is denied when I try to access the shared folder (for my pictures) on Windows 7. Now if I transfer them to the Users/Public/Pictures folder, it will transfer them in just over 5 minutes. Still a little slow, in my opinion, and not where I want them. Why can I transfer there and not into the folder I want them? And why is quicker to transfer while sitting at my XP system?

I have made sure that all the systems have the same workgroup name. I have also tried disconnecting the power from my modem, router, and all systems then powering each one up one at a time. That was suggested to me before. It didn't change anything.

One last thing. While starting my Windows 7 system, as soon as it was at the desktop, I tried to transfer the pictures again and the transfer took off. Almost immediately, it said that there was 20 seconds left. It was flying like I thought it should. Less then a minute into the transfer, it hit a wall and changed to about 20 minutes. Go figure. I checked my settings for the folders I want to transfer to and they are set as shared. Maybe at that point, a security program started up. I don't know. I do have a trial version of Norton's Internet Security installed. It came preloaded with the system. I was thinking of removing that and going with Avast free. I have checked any firewalls and did disable them. No difference.

I tried to list everything I've tried. Hopefully, some helpful info in there. I find it strange that I can access the shared folders but not transfer from them. Any thoughts on what to do? Is there a setting in Windows 7 that needs to be changed?