Sony PCG-NV290 - Manual (Page 162)

VAIO Computer Quick Start
162
To check your system’s memory
1 Turn on the computer, or restart the computer if it is already on.
2 Click Start on the Windows® taskbar, point to All Programs, and then
point to Sony Notebook Setup.
3 Select Sony Notebook Setup from the submenu. The Sony Notebook Setup
dialog box appears.
4 On the About This Computer tab, make sure the System Memory
displayed in the System Information box matches the amount of memory
installed.
The displayed memory may be less than the installed memory due to the
amount used by the display adapter.
Sony Notebook Setup Dialog Box