Let me ask you something. Does your computer meet Trickster's minimum system requirements?
Here's the list of system requirements:
1.) Windows 98/2000/XP/Vista (Vista's not as compatible as the other three OS's mentioned, but the game still works on Vista!)
2.) 800 MHz processor or higher
3.) 256 MB of RAM or higher
4.) 3D supported graphics card
5.) DirectX 8.1 or above
6.) 2.7 GB of free hard drive memory or higher
7.) Broadband Internet Connection
If your computer does not or barely satisfies ALL the requirements mentioned, then that's probably what's causing your game to freeze when you try to access MyShop.
I am currently taking a break from Trickster. Right now, I am playing LaTale