Sony eSupport>VAIO VGC-V517G>Manuals,http://esupport.sony.com/US/perl/model-documents.pl?mdl=VGCV517G
On this page l would like you to left-click on - VAIO User Guide, under the Manuals heading.
A small window will pop up on the left side of the screen. It took almost 30 seconds before I saw the first page. The screen was white in the meantime.
(PDF file is downloading in the background)
In the Bookmarks to the left, scroll down to -
Upgrading and Maintaining Your VAIO Computer, and left-click on the + sign to expand the file.
Left-click on Installing Memory.
Page 92 has details, and illustrations, on removing the computer back cover.
Barring something prevents you from downloading this PDF file;
1) Computer off, and unplugged from power.
2) Observe Anti-Static precautions
Your body carries Static electricity.
Static WILL fry out (Short Circuit), the hardware components inside a computer.
Computer unplugged from power, computer on a table, computer case open, TOUCH an unpainted surface of the metal frame.
This will relieve your body of Static.
Should you get up, and walk away in the middle of working on your computer, upon your return Touch the metal frame again ]
3) Disconnect any Peripheral devices connected to your computer.
Advise lay a clean towel on the table.
Gently lay the computer down on the towel, LCD screen face down.
4) Slide the back cover towards the top of the LCD screen.
It will only slide up so far, then the top of the back cover, is tilted towards the back of the computer, and lifted off.
Set the back cover aside.
5) Back of the computer towards you, the Ram Memory Cover is on the Right side.
The cover looks like a panel. It is rectangular shaped. There are two screws holding the cover on. Remove these two screws, lift the Memory Cover off.
The Ram Memory modules are right there.
Need further guidance in removing and installing ram memory modules, state in a Comment.
(Believe upper right of your page is the Comment button)