Windows expanding to the network drive

I have several PC’s that when opening Explorer will expand the tree beginning at the F drive (first network drive). This has caused me much greif in the past because I’m expecting the tree to be expanded from the C drive and w/o looking closer I think see something on the C drive that shouldn’t be there, only to delete it, only to soon find out that what I’ve actually done is to delete something from the network that shouldn’t have been deleted. Needless to say, I do look closer now. I have tried the registry “FriendlyTree” route several ways, but nothing seems to work. The tree still wants to expand the F drive. Any answers out there?
Thanx in advance JF