I have sony vaio vgn a215z and volume buttons don't work

What operating system do you have on the Vaio? Check if there is some options in Control Panel - Sound menu...

There is a specific set of driver you have to install for your computer, Vaio laptops use the ACPI fucnction to control hardware access like volume / brightness control etc
You need the ACPI driver installed for Fn key to work
Install Sony Notebook Control Driver for windows vista
Install Sony Utils.dll
Install Sony Shared Library
same for your sd card reader just reinstall the drivers
http://esupport.sony.com/US/perl/swu-list.pl?mdl=VGNSZ230PB&LOC=3
sony only supports the factory shipped os drivers you will have to find the drivers for 7 elsewhere or reinstall your factory os

The plus (+) and minus (-) volume control buttons on the touch sensor bar above the keyboard may not work properly if the touchpad driver is not installed properly.

The other buttons on the touch sensor bar, such as the play, forward, or rewind buttons, may still work properly.
To resolve the issue, download and install the original Synaptics® Touchpad Driver (or an updated version of that driver, if available) from the Drivers & Software link on this page.

Install VAIO Event Services (Notebook Utility) to resolve the volume control issue:
here is the Driver download link for Windows Vista.

http://support.vaio.sony.eu/computing/vaio/downloads/preinstalled/index.aspx?l=en_GB&m=VGN-CR21E_P

Try to download and install the utilities and applications http://support.vaio.sony.eu/computing/vaio/downloads/updates/index.aspx?l=en_GB&m=VGN-CS11S_P#

HI,

As i don not know which exact model vaio you have i have provided the link to All Vaio driver downloads.

http://support.vaio.sony.eu/downloads/preinstalled/preinstalled.asp?site=voe_EN_GB_cons&c=0&s=VGN-SZ&m=0

Hi there.
Go here to Vaio support, download your audio driver, reinstall it and you should be good to go.

http://support.vaio.sony.eu/downloads/preinstalled/preinstalled.asp?site=voe_EN_GB_cons&c=0&s=VGN-CR&m=2854

Good luck and thanks for using FixYa!!

i have a sony viao vgn css220j laptop which key using keboard for booting

Hey MIDO Try This Tool

VAIO Launcher 1.4.11 Update Program

This program will update VAIO Launcher pre-installed on the VAIO model listed below.

VGN-S4HP/B
VGN-S4HRP/B
VGN-S4M/S
VGN-S4XRP/B
VGN-S4Z/S
VGC-V3S
VGC-V3M
VGN-FS285H
VGN-A497XP
VGN-A417M
VGN-A417S
VGN-FS295XP
VGN-FS215Z
VGN-FS215M
VGN-FS295VP
VGN-FS215B
VGN-FS215E
VGN-FS215SR
VGN-FS215MR
VGN-FS285M
VGN-FS285B
VGN-FS285E
VGN-FS215S
VGN-B3XP
VGN-B3VP
VGN-S4XP/B
VGN-S4VP/B
PCG-K415S
PCG-K415B
VGN-FS195XP
VGN-FS195VP
VGN-FS115S
VGN-FS115Z
VGN-FS115M
VGN-FS115E
VGN-FS115B
VGN-FS115ZR
VGN-FS115M -- ( Thats Ur MODEL)
VGN-A397XP
VGN-A317S
VGN-A317M
VGN-S3XP
VGN-T2XP/L
VGN-T2XP/S
VGN-T2XRP/S
VGN-S3VP
VGN-S3HP
VGC-RA304
VGC-RA204
PCV-RS704
PCV-RS702
VGC-M1
VGC-V2S
VGC-V2M
VGN-T1XP/L
VGN-T1XP/T
VGN-B1XP
VGN-B1VP
VGN-S2XP
VGN-S2VP
VGN-S2HP
VGN-S2XRP
VGN-S2HRP
VGN-A297XP
VGN-A295HP
VGN-A217S
VGN-A217M
VGN-A215M
VGN-A215Z
PCG-K315Z
PCG-K315S
PCG-K315B
PCG-K315M
This update resolves the problem of registered applications not launching from the VAIO Launcher toolbar.
Note: This program requires VAIO Zone 1.2.05 or later. If your VAIO model comes with VAIO Zone 1.2.02, you must first update VAIO Zone before running this program.
Download and installation
1. Download the file SOAVZN-01028300-UN.exe and save it to a download directory
2. Close all running applications
3. Go to the download directory and double-click SOAVZN-01028300-UN.exe
4. The InstallShield wizard starts
5. Click Next and wait while setup is installing the new software
6. Click Finish when the installation is complete

HERE

What version of windows are you runing? If it's pre xp it's probably nothing you are doing, windows's likes to corrupt itself over time. You can bypass your on keyboard volume by right clicking on the speaker icon in your system tray (lower right corner where your clock is) and click open audio properties, everything can be controlled in here. Good Luck