No, this is a very common problem, and it has a simple fix.
Both computers need to have identical accounts. So if computer #1 has account "joe" with password "abc123" then computer #2 needs an identically configured account. Else you get those login boxes.
I keep getting asked for a user name and password when I try to access my shared folders located on the Windows 7 box from my windows XP laptop. I have tried the login info for both boxes and have had no success. I have no idea what user name and password its asking for...can someone help?
I am able to remote into the windows 7 box from my xp box using VPN without problems. Could it be somthing with my router.