Windows 7 Roaming profile failed, always login into temp profile.

Hello Experts,
Am transferring my workgroup network into a domain network with roaming profiles, most of the computers are win xp, I did all the XP PCs without any problems, I went to user profile and export it to the shared folder on the server then from the user properties/ profiles, I wrote \\server\sharedfolder\username and then went to the pc I joined the domain then login with the domain username and the profile loaded successfully, but when doing the same procedure to computers that have win7 even if I add V2 when exporting the profile, I mean when I exported the profile to the new location I wrote \\server\sharedfolder\username.v2 , the profile got exported successfully but when I join the domain and logon using the domain username I get error message
“You Have been logged with a temporary profile”
My server is running windows 2008 R2, the users have full control on their roaming folder.
Any help is very much appreciated.
Thank you very much in advance.