Okay so I took over for the person before without receiving any information regarding the setup of the group policy for a particular group of users. This group of users has several things locked down to prevent them from doing certain things. For instance, they do not have access to the C drive.
So now here is the weird thing. If you are in Word or Excel (etc) and go to open a document you are able to see the available drive in My Computer (floppy drive, network drive, cd-rom drive, usb flash if you have one inserted). But if you are using a website (in Internet Explorer 7 or Mozilla FireFox 2) that allows you to upload a file (like Monster.com and a resume), you are only allowed access to the desktop. The Open File dialog window does not list My Computer or any of the other drives as options in the drop down.
I am assuming (and hoping) that this has something to do with the GPO. The only other thing I could think of is that these users use machines with DeepFreeze on them, but I have never seen a setting in DeepFreeze that would affect this. Any ideas?