I created a DLU for our students and I put them in the group user.
On a Windows 7, I get the access denied, yet in GPEDIT.MSC, local security, allocation of user rights, user group is inside.
If in the DLU, I put my users in the group administrator, it works.
On XP, no problems

Thank you in advance for your help, I have hundreds of computers installed.

Our Config:
Novell SUSE Linux Enterprise Server 11 (i586) 11 Service Pack 1

Station Win7 x64
Agent version on client:
Policy Manager :
User Management :