If a computer has 4 gigabytes (GB) of random-access memory (RAM) installed, the system memory that is reported in the System Information dialog box in Windows Vista is less than you expect. For example, the System Information dialog box may report 3,120 megabytes (MB) of system memory on a computer that has 4 GB of memory installed (4,096 MB).

Note: You can access the System Information dialog box in the following ways:

• Click Start, type System in the Search box, and then click System under Programs.
• Double-click System in Control Panel.
• Click Start, right-click Computer, and then click Properties.
• Click Show more details in the Windows Vista Welcome Center window.