Windows 7: Trouble mapping folder from Vista 64 to Win7 64

Good afternoon everyone, hoping to get some help here. I just acquired a Gateway laptop with Windows 7 64 Pro, and for some reason I cannot for the life of me get it to map a folder on my Vista 64 Ultimate desktop. I can connect to the public folders, but I cannot connect to my private user folders. I have another laptop in the house running Windows 7 32-bit that maps just fine, and also I can go from the desktop to the Gateway with no issues. The only problem I have is getting in to my private user files. Whenever I try to connect to one, I get a message saying I dont have permission. I can get to \\mediapc where I can see the shared folders, and I can get in to \\mediapc\public with no problems, but if I try to get in to \\mediapc\users, for example, I get that message. Again, I can get in to it just fine from my 32-bit Gateway laptop.

I have tried turning off both firewalls at the same time with no luck, so I know its not a firewall issue on either computer. Does anyone have any other ideas? This is my first time asking for help on here, so if I need to provide screenshots or anything please let me know. Thanks!!

Between Windows 7 systems you share any folder via Homegroup. Vista systems cannot participate in that luxury. You have to go via the public folders.

I am not trying to share via Homegroups, I am trying to do basic drive mapping and folder sharing. I am already sharing folders on the Vista PC with a Windows 7 32-bit laptop. However I cannot share those same folders on another Windows 7 64-bit laptop I have.