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I have a program here (with access to the source code, no problem there) that I need to install on many customers PCs.

All of them still run under good old XP (SP3), but on a few (very few) of them I can't start the application, because when I try opening the IPC channel (I need that for a few service functions) I get an "Access denied" exception.

The user is a member of the "Administrator" (!!!) group.

Which user rights would I have to grant to allow the creation of an IPC channel? ACL problems? Group policy?

Sorry for asking, but I'm not a system administrator and this stuff is seriously freaking me out. :-(