user privileges to install / move files etc

To install the software need administrator privillege and to access the share on the network check the share permission for the share folder.

What the error you receive when accessing the share?

Well, the local permissions to install a program is really a different issue than the read/write permissions on the network resource.   So it the problem that the person can't copy the files from the network resource.... or is the problem that the person can't install the application regardless of where the install files are located?

Here is a pretty good article on how to set network share permissions.

http://support.microsoft.com/kb/304040

Normally, you'd attempt to limit your users to being just "standard users".... without any administrative powers (just like what you've got now).   That is generally considerd more secure, since the ordinary user can't do too much harm to their own PC or the network.  However, that does put a burdon on the IT staff, because only they have adminstrator rights, and only they can install software, install printers, etc.

So, it's just a matter of a balancing act... how much security do need (or want) vs. how many IT resources do you have.   Most corporate environments with a dedicated IT staff tend to limit their users to just the standard user.

On the other hand, you could just add that user to the local Adminitrators group... let them do the installs that they need... and then take them out of the group when they are done.

You can "remote" into the PC to add and remove users from the Administrator Group.   The easest way is to just launch the Computer Management console (compmgmt.msc) then change to the remote PC, add or remove at will...

I would hesitate to say that's the only way.... but that certainly is the most direct way to do it... temporarily grant them admin rights (by putting them in the Administrators group).

Of course, there are always other options... for example, some remote login tools allow you to "shadow" a logged in user and allow you to enter your elevated credentials via the "Run As" command.   However, that pretty much means you'll have to do all the work... and stay with them (albeit remotely) while they are installing things.

Unfortunately, that means that they also get all permissions to everything on the PC.  There's no practical way to limit the permission to just installing application, nor is there a practical way to audit what the do.

There is a way to turn on auditing for the file system... which will show you where they are creating, deleting, and copying files... but that's not the same thing as what you're talking about.