|Your problem of both the built in speakers and the amplified speakers plugged into the headphones jack outputting sound at the same time is probably NOT caused by any software problem. |
The headphones jack on laptops has a mechanical switch inside of it. It's supposed to disable the sound from going to the speakers built into the laptop whenever you plug a plug (on a cord) into the headphones jack.
If you have plugged into the headphones jack a lot, it's common for that mechanical switch to malfunction. You could try plugging a plug into the headphones jack, wiggling it, then pulling it out, that may make that switch work correctly, but the only real solution is to replace the headphones jack - that's an item frequently replaced by laptop repair places.
"....Realtek but I'm not sure which one I originally had."
The correct sound "drivers" are in the software downloads for your model, available on the Toshiba web site.
"When I restarted my system it detected that it had unsupported hardward and a setup wizard popped up to reinstall a driver. I selected automatically search for the correct driver and it installed the Realtek HD device"
If Windows XP finds the correct drivers automatically when you allow it to search, then you didn't actually un-install the sound software permanently - that's fine - your sound software should work correctly in that case, if it was installed correctly previously.
(It's extremely unlikely the sound software is built into XP itself, unless the computer or the sound adapter chip or chipset was first made before about 2001 when XP was first released. Your brand system has the correct sound software already installed when you first get it, and if the original brand name system software installation is still intact, or if it has been re-loaded properly using the Recovery disk or disks for your model. )
If you actually DID un-install the "drivers", you DO NOT install the sound drivers that way.
Sound "drivers" downloads or sound "drivers" installations from a CD always have associated software that must be installed properly as well as the actual drivers. If you install ONLY the drivers, the sound software has NOT been installed properly.
Unless the instructions for installing a device tell you otherwise.......
(this ALWAYS applies to sound adapter software, and video adapter software...)
You DO NOT install drivers for a device while booting into Windows, if the software for the device has not been installed yet - when Windows detects a generic device or New Hardware while booting, you allow it to search for drivers, it doesn't find any, and it wants you to show it the location of the drivers - CANCEL that, continue on to the desktop, and install the software for the device using the proper installation from a CD or the proper installation file that you downloaded from the web.
If you DID install drivers that way,
(The following also applies if you want to re-install the sound software)
- go to Control Panel - Classic View - Add/Remove Programs and Un-install the software you installed, reboot, DO NOT install drivers while booting.
- go to Device Manager.
(e.g. RIGHT click on My Computer - Properties - Hardware - Device Manager)
If the sound adapter is still listed, RIGHT click on it and Un-install it.
If that was there, and you un-installed it, Reboot at least once.
DO NOT install drivers while booting.
Install the sound software properly by running the proper download you got from the web, or if you have the CD that came with the sound card, or the CD that came with the computer that has the Drivers on it, run the sound software installation from the installation program on that.