The following tip is to allow Vista 32bit to use up to 4GB of RAM in case you can't/don't-want-to upgrade to Vista 64bit and you have more than 3GB of RAM. You can force Vista 32bit to use past 3GB of ram by enabling Page Address Extension (PAE) if you have a 64bit processor like the tx2500z, however this is limited to up to 4GB. If you want to use more than 4GB you need to upgrade to Vista 64bit or Linux. How to enable Page Address Extension (PAE)? Open Command Prompt as an Administrator. (Start Menu -> Search: 'cmd' -> Right Click -> Run as Administrator) Type: BCDedit /set pae forceenable press [ENTER] Restart your computer. Vista should now recognize your full 4GB of memory. What's the downside? Vista requires some extra work to use the extra memory addresses added by PAE, so you need to decide if the extra memory is worth the extra overhead. When it comes to programs that are not very "memory-hungry", enabling PAE may only slow down your computer. How do I disable PAE? Open Command Prompt as an Administrator. Type: BCDedit /set PAE forcedisable press [ENTER] Restart your computer.