Can not access Vista PC drives - Vista security sucks.

I bought 5 new Vista Business machines, new copies of Office 2003
Professional to replace 5 XP boxes. Big mistake. Huge. If I see one
more Vista security popup I am going to redline. I've loaded them up,
copied all the docs, mail and mail settings and anything else that needed to
run on our peer to peer network. Mail works. Printers work. Can see all
the computers/drives in the WORkGROUP. But we can not get any of the Vista
boxes to allow the others to open up drives for sharing. Brought one of the
XP boxes back up to store the accounting files for access.

I think I read every post and did every suggestion on MS site and forum.
Most are just posting links to solutions that do not work. All boxes are set
to private, no passwords needed. I think I have jingled every setting.

Why can I not open drives/folder/files on the other boxes? Can I
completely turn these boxes down to XP securty levels.