How to increase video memory

Ok let's se if this will help. https://youtu.be/a__72AeGYLY

In order to play RollerCoaster Tycoon® 3, you will need a PC running Windows with the following minimum requirements.
Minimum and recommended computer specifications are as follows:
Operating System: Windows® 98/Me/2000/XP (Windows® XP recommended)
Processor: Pentium® III 733 MHz or compatible (Pentium® 4 1.2 GHz or compatible recommended)
Memory: 128 MB RAM; 256 MB for XP (256 MB; 384 MB for XP recommended)
Hard Disk Space: 600 MB free CD-ROM Drive: 4X CD-ROM or faster (8X or faster recommended)
Video: 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)*
Sound: Windows® 98/Me/2000/XP-compatible 16-bit sound card*
DirectX®: DirectX® version 9 (included) or higher

you should increase the virtual memory of system,to increase the virtual memory :-
->right click on my computer goto to properties tab
->then goto advanced tab
->performance setting
->advanced tab
->virtual memory

now increase the virtual memory with current

OR

:>type chkdsk command in dos

Dedicated video memory is memory contained on a graphics cards which is separate from the RAM plugged into the motherboard. The memory on dedicated graphics cards is set aside specifically for the use of processing 3D graphics and effects. Increasing dedicated video memory requires upgrading a video card with one that has more memory built in.

I've noticed that in the bios you can't increase Dedicated video memory because the max for your laptop is 256 but if you check your overall video memory with the shared memory added on by right clicking on your desktop and clicking screen resolution, go to advanced settings, and it should show your adapter with the amount of total graphics memory, the dedicated video memory (video memory of video card), system memory(Mine is 0), and shared video memory ( Ram being accolated together with the graphics card making more video card memory in all). If you switched to XP however, you will probably have less video card memory. Everything should be fine if your on your laptop's default operating system (Mine is windows 7 home premium).

Unfortunately, Dedicated video memory cannot be changed. Only the Allocated system memory. The dedicated video memory is onboard memory, like a video card in a desktop machine has it's own RAM. Your out of luck, unfortunately.

It sounds like a computer memory problem. If you have Windows Vista, you can quickly increase your memory by plugging in a flash drive or camera memory and choosing the option to increase your system's memory capacity and assigning 100% of the drive to your computer.

Run Registry Editor (Regedt32.exe).
2. From the HKEY_LOCAL_MACHINE subtree, go to the following key: \System\CurrentControlSet\Control\Session Manager\SubSystems
3. Select the Windows value.
4. From the Edit menu, choose String.
5. Increase the SharedSection parameter.
For Windows NT:
SharedSection specifies the system and desktop heaps using the following format:
SharedSection=xxxx,yyyy
Add ",256" or ",512" after the yyyy number.
For Windows 2000, Windows XP, and Windows Server 2003:
SharedSection uses the following format to specify the system and desktop heaps:
SharedSection=xxxx,yyyy,zzz
Increase the zzz number to "256" or "512."

Best Of Luck!!

I don't wish to sound rude but if you don't know how to do this, you prolly should just let windows continue managing it. A few wrong keystrokes can have major repurcussions