If it is a form of Vista 32 Bit you need a Vistas 32 Bit Driver and if it is a 64 Bit version of Vista you need a 64 Bit Vista Driver. If it is XP you need to use either the 32 or 64 Bit Driver for XP depending on what version of XP you have. Assuming that you are using the normal XP you will need a 32 Bit Driver but that's a very unwise guess as I have no idea of which OS you have loaded.
Anyway regardless of the OS you are using if you have enabled the Auto Update Function when you reinstalled the OS then simply by allowing it to log onto Windows Update Server you have prevented the ability to install any Unsigned Drivers and in the case of Sound Drivers these are the Realtech AC 97 Type Drivers that can be called several different names by the different makers like Simtel CM 4414 or something like that.
You really only have 2 types of Sound drivers possible either Sound Blaster or Realtech and the Realtech ones need installing after you install the OS from anything but a System Recovery Disc. So if you have used something like a Toshiba XP Recovery Disc you need to install the Sound Driver before allowing the computer to access Windows Update Service.
I don't know if this is the same with your Toshiba but a Dell that I currently have here requires you to install the Sound Driver after Installing Vista as it is not possible to install it with the OS well Vista at least though it can be slipstreamed to a XP Install Disc without problems.
Basically you need to reload the system and this time before starting Windows for the first time select Not Now when you are prompted to allow Live Updates. Ideally with any form of Windows you should do this on the reload till you have all the required drivers installed then you can allow the system to access the Windows Update Server and it will not prevent you from installing drivers.
It is also possible that the Sound Card or M'Board has developed a fault and this is stopping the sound from being produced though with most Sound Drivers you need to install them as soon as you have finished installing Windows.
If you look on the Toshiba Web Site for Drivers you will see that there are 4 different Satellite Pro A210 they are the following full designation
Satellite Pro A210 EZ2201
Satellite Pro A210 EX2022X
Satellite Pro A210 EZ2202X
Satellite Pro A210 EZ2203X
Listed here
http://www.csd.toshiba.com/cgi-bin/tais/su/su_sc_modSel.jsp
What you need to do is select the correct model and then chose the Sound Driver for your Operating System so that will be either XP 32 or 64 Bit or Vista 32 or 64 Bit. If there is no designation after the OS's Name it is a 32 Bit Version. AS these are all Realtech Drivers you need to prevent the computer contacting the Windows Update Server before you install the Realtech AC97 Sound Driver.
Col