Vista - Startup folder missing/duplicated for user

One of the guys I work with personal start folder disappeared (deleted
accidentally perhaps), so I simply recreated it and added the appropriate
shortcuts to it, but the programs won't launched at startup. I rebooted
again, but they still didn't start.

I didn't know why, so I just moved all the shortcuts to the to the "All
Users" startup folder. They launched fine, but now 2 copies of every
program launched.

I checked using Defender, and they're listed in there twice, once in the
"User Profile Startup Folder" and once in the "All Users Startup Folder."
I'm not sure why because there's only 1 shortcut on the disk, and that's in
the "All Users" startup folder.

It appears that Vista thinks the all users startup folder and their personal
user startup folder are the same.

How do I change it so programs in the user's profile startup folder load
when Vista starts, and that programs in the "All Users" statup folder don't
load twice?

Thanks...