Hello Robddog and welcome to LQ,
could you please provide more information?
Which distribution and which version of Samba are you using on your PDC?
Which permissions don't work? connecting from the Win7-machines to the PDC? Do domainlogins work?
Do you fail to browse the shared directories?
What do you mean with "installing programs", the setupfiles are shared on the PDC?
Which versions are the clients WinXP/Professional?, WinXP/Home?, Win7/Professional?, Win7/Home?