Apparently hp pavilion ze2000 is a notebook computer.

1. Audio Drivers Free Download
2. Hp Pavilion Ze2000 Drivers

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The term CARD is frequently mis-used. It's NOT a sound CARD when it's built into the mboard - it's just a sound adapter. A device adapter on a CARD can be physically removed.

Since it sometimes sounds fine, it's not likely there's anything wrong with the software that has been installed for that, but you could try un-installing that and installing it again. See below.

If the headphones jack has been used a lot, this is a lot more likely to be the cause of your problem..

The headphones jack on laptops and netbooks 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 get one or both speakers working fine, but the only real solution is to replace the headphones jack - that's an item frequently replaced by laptop repair places.
OR - you could make do by plugging amplified speakers into the headphones jack.
..................

Un-installing and installing the 'drivers' for the sound.

I'ts recommended that you DISABLE any and all anti-malware program's resident module(s) - a part that runs all the time looking for suspicious activity, from running in the program itself BEFORE you un-install and install sound software (and software for many other things you install yourself, and major software packages such as SP3 updates that can be installed by Windows Update), because they are known to sometimes interfere with software installing properly, and in that case you usually get no error messages about that while installing the software.

E.g. AVG 2011's resident module is it's Resident Shield.

If you don't know how to do that, tell us which anti-malware software you have installed.

After you have installed the software, enable the resident module(s) again.

Sound 'drivers' always have associated files that must be un-installed and installed properly along with the actual drivers.

Th HP web site has the proper sound 'drivers' download for your sound adapter in the downloads for your model. Download that.

Go to Control Panel - Classic View - Add/Remove Programs and Un-install the sound software, 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 if you have the CD that came with the brand name computer that has the Drivers on it, run the sound software installation from the installation program on that.
......

Installing the sound 'drivers'. You must do that properly.

Sound and video 'drivers' always have associated files that must be installed properly along with the actual drivers. If you install only the actual drivers, it's likely the device will NOT work properly.

Unless the instructions for installing a device tell you otherwise..
(this ALWAYS applies to video and sound adapters )

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.
The same applies no matter when Windows finds New Hardware !

If you DID install drivers that way,

(The following also applies if you want to un-install previous software, or re-install the same software) /genius-ilook-300-web-camera-driver-for-mac.html.

- for video 'drivers'..

- go to Control Panel - Classic View - Add/Remove Programs and Un-install the software you installed, reboot, DO NOT install drivers while booting, let the desktop screen fully load.

Install the video software properly by running the proper download you got from the web, or if you have the CD that came with the video card that's in a slot, or if you have the CD that came with the brand name computer that has the Drivers on it, run the video software installation from the installation program on that.

for sound adapter drivers..

Audio Drivers Free Download

- go to Control Panel - Classic View - Add/Remove Programs and Un-install the software you installed, reboot, DO NOT install drivers while booting.

Hp Pavilion Ze2000 Drivers

- 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 if you have the CD that came with the brand name computer that has the Drivers on it, run the sound software installation from the installation program on that.