How do I use dual user for Maplestory on a Vista labtop?

If there is a thread or post for this, please indicate me toward it. But otherwise here are the issues:

1. Whenever I switch users, and try to run Maplestory on the second user, an Error comes up, from Maplestory, not a computer error.

2. Whenever I switch users, when I come back to the first user my keyboard (on a labtop) is always frozen and I have to force the labtop to restart by pressing the on/off switch.

I'm dumb when it comes to computers so yeah...I use a Windows Vista 2007 Labtop with Service Pack 2 if it helps. If you need more information just ask, but if it's something complicated please tell me how I get there to find it lol...I'm noob I know.

It needs to be a 64 bit version of Windows Vista for it to work for sure. If you have 64 bit, be sure to make both accounts admins. For the keyboard freezing, I would say dont switch users while maple is still up. Alt tab out of it and then switch. You might also be able to get the keyboard back by ending the explorer.exe process, but you would need to have takemanager open before switching.

How do I check if it's 64 bit?

And thanks.

Edit: Nvm I checked this System thing, it says 32 bit F7. Thanks anyway.