Acer 5950G, i7 computer

I have just bought a new Acer 5950G, i7 computer recently. There is a hotkey at the left top corner for turning on the ACER Arcade instant on program without booting the window.
After I pushed the hotkey, I can access every user's folder without using any password. The instant on programme will violate all the securety check in the computer.
WHAT A DESIGN FAULT, AFTER KNOWING THAT THE PROBLEM, I HAVE CALLED THE ACER COMPUTER HONG KONG OFFICE, BUT,,,,,,THE ANSWER IS: THEY DONT KNOW HOW TO FIX IT, OHHHH, HOW I CAN SHARE THE COMPUTER WITH FOUR OTHER USERS???????

 

Aspire 5950 is a new unit so I don't know if it works like it used to but Arcade thingy used to be a stripped down WinXP with a new skin running from a hidden partition.
I would have deleted the partition altogether- brute force method I admit but privacy is a bit more important than convenience in my book.

Another possibility- far less brutal and more secure is to use TrueCrypt. I have a separate encrypted partition that I have to mount every time I log in to my account.

 

I just got this one a few days ago.

If it bothers you that much, just remove ACER Arcade from Programs/Features; it'll disable the hotbutton, but just remember that anyone with a LiveCD/USB of Linux can do exactly the same thing unless you've disabled CD/USB booting and password-protected the BIOS, which I'm gonna go out on a limb and say you haven't.

The games are e anyways, so just uninstall arcade