When I try to play a game on my laptop a white screen

Post your System specs plz

Does your system meet these Requirements?

In order to play RollerCoaster Tycoon� 3, you will need a PC running Windows® 98SE/Me/2000/XP (Windows® XP recommended)
(A version for the Apple/Mac computers is NOT planned at this time).
You also need DirectX® version 9.0c (included) or higher.

Minimum and recommended computer specifications are as follows:

Minimum System Requirements
CPU: Pentium� III 733 MHz or compatible (Pentium� 4 1.2 GHz or compatible recommended)
RAM: 128 MB RAM; 256 MB for XP
Hard Disk Space: 600 MB free
Graphics: Any ATI Radeon� or GeForce� 2 with 32MB or higher; or other video card with 32MB and hardware T&L (ATI Radeon� 64 MB SDR or GeForce� 2 Pro or other video card with 64 MB or more memory and hardware T&L recommended)*

CD-ROM Drive: 4X CD-ROM or faster
Sound: Windows� 98/Me/2000/XP-compatible 16-bit sound card*

Recommended System Requirements
CPU: Pentium® III 1.2 GHz or faster recommended
RAM: 256 MB; 384 MB for XP recommended
GFX: Radeon 9800 or Geforce FX 5600
SOUND: PC audio solution containing Dolby Digital Live required for Dolby
Digital audio
CD-ROM Drive: 8X or faster recommended

Notes on Roller Coaster Tycoon 3 System Requirements

Note: Windows Media CODEC version 9 is required and is installed with
RollerCoaster Tycoon® 3. This technology is also installed when updating to
Windows Media Player 10.

I don't have any idea about what most of that is, or how to check it. I have an Acer aspire 5100-5674 with windows vista. I got it in 2007 if that helps.
I'm really not much of a computer person

Have you updated your VGA drivers ?

no, how do i do that?

It seems it has ATI X1100 VGA,so go to www.amd.com and in top right section you can choose your OS and your VGA and download the driver

which driver do I need to download?