Sony VGN-AR170GU1 - Manual (Page 136)

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Upgrading Your VAIO Computer
7 Remove the new memory module from its packaging.
8 Slide the memory module into the memory module slot and push it in until it clicks into place.
!
If you use only one memory module, make sure to insert it to the slot that is closer to the back of your computer.
Do not touch any other components on the motherboard.
9 Replace the memory module compartment cover.
10 Tighten the screw on the bottom of the computer.
11 Reinstall the battery and turn on the computer.