My desktop is locked... or something.
 

I can't modify my desktop. I can't add a new folder or bring anything onto it. When I try to do this it tells me I don't have sufficient privileges to do this, and that the desktop cannot be modified. I am on the master login and there is no other login at all. This is also effecting my internet downloads. I now cannot download ANYTHING AT ALL. No dashboard widgets, no psds or anything. Please help because I'm about to kill myself.

right click the desktop and click get info, to go the bottom and expand Ownership & Permissions. Make sure it says You can Read & Write. Expand details and make sure it says Owner, your username, access read & write. Hope this fixes it, this happened to me once.

has it alwas been like this?

check your user account information and make sure you have the privleges to alter things like this.

Could this be an Apple Remote Desktop issue?