I just installed windows vista into my old sony vaio desktop. Every thing is working as it sould but I lost all sound through speakers. It says (no audio device is installed) Can any 1 help?

THX!You need to re-install all the Drivers from the Driver CD that shipped with the PC.That cd is long gone....I tried GOING on the sony web site to down load the sis driver but its only for win xp =/ Any other ideas???Could you post the MAKE and model of your Sony PC and more importantly, the sound card? the sound card manufacturer's site might have Vista drivers.OS Name MICROSOFT Windows XP Professional
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Manufacturer Sony Corporation
System Model PCV-RX741(UC)
System Type X86-based PC
Processor x86 Family 6 Model 6 Stepping 2 AuthenticAMD ~1526 Mhz
BIOS Version/Date Award Software, Inc. ACPI BIOS Revision 1003VX, 5/16/2002
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name PETIE-B4EYZEF64\Petie i
Time Zone Pacific Standard Time
Total Physical Memory 1,024.00 MB
Available Physical Memory 560.56 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 2.33 GB

I cant seem to find the sound card..I do know its an SiS soundcard if that helps??

Here you go mate:
http://esupport.sony.com/US/perl/swu-list.pl?mdl=PCVRX741

It should be SIS 7012. The link contains everything you need for your model.For some reason I couldn't edit my post, so I will make a new reply to add something:
Did your computer originally come with Windows Vista installed? There's no official SiS 7012 Driver for Windows Vista. And your list MENTIONS that you're running XP. However, you can try a scan with Drivermax in an attempt to find a driver for vista.