Sony PCG-SR5K - Manual (Page 78)

VAIO® Notebook User Guide $$
Confirming Added Memory Capacity
1
Turn on the computer.
2
Click the Start button, point to VAIO, and then click Sony Notebook
Setup.
3
Click the About This Computer tab. Check the System Memory
displayed in the left panel to confirm that the correct memory
amount is displayed.
If the memory amount on the display is not correct, shut down the
system, turn off the computer, and repeat the installation procedures.