General access denied error

I am updating the AD user details in my application using a generic login.
The problem is it fails for few user detail update saying "General access
denied error" at
System.DirectoryServices.Interop.UnsafeNativeMethods.IAds.SetInfo()
exception, but the users permission level is similar to other user.

Can any one help me out in the problem? What right i have to give for my
generic account to allow it to edit all the AD user? (other than adding it in
admin group)

[Eber]

In our era, there are some "service accounts" to update the permissions of the account. They should not have administrator permissions Enterprise. These accounts are further blocked by: Cannot change password. The user can not access the devices. Those developers are given the credentials of the service account for the handling of AD. I hope this will help you solve your problem. If you are still confused about this after searching the internet I'm sure you'll get an appropriate solution. Thanks.