User A is in group 1. Group 1 has Full Control over a network shared folder that contains an executable (Office installation). User A gets the error: "... The specified path does not exist. Check the path, and then try again." on Windows XP. Windows 7 works fine. Add user to Domain Admins group, XP works fine.
If I add Group 1 to the Administrators group on the network share PC, it works. Why would it be checking against the local admins group of that PC when its being executed via the network?
Basically, what group does User A need to be in to execute remote executables from a network share on XP?
Map the share as a drive and see if the user can run the executable from the mapped drive. I've seen setups that just didn't work over a share on XP.
also, if you just put the user in the group, they may need to log out and back in to pick up the new AD group membership.