ACPI/HPQ0004 PCI Unknown Device Driver [solved] Thursday, 2011.10.13 J.D. 69 comments Q. Hello, I have a HP laptop showing ACPI/HPQ0004 unknown device and I need to find the right drivers.

I have seen on many forums that ACPI makes a lot of troubles to a lot of users under Windows. I will try to explain several things about ACPI and I hope that you will be able to solve your problems after you read this article.

I cover only most encountered issues, but always there is a choice even if it's called ACPI disable.:) The computer ACPI support is detected in the setup stage, but there are less frequent cases when ACPI is not detected and the Standard PC HAL is installed. If you want to force the installation of the ACPI HAL: 1. At the blue screen of the Windows XP setup when it prompts you to press F6 for additional mass storage devices press F5 and you will have a list of options.

Choose the proper HAL for your machine remembering that there are also different HALs for multiprocessor machines. Complete the setup, go to Setup / Control Panel / System / Hardware / Device Manager / Computer. If you have listed the Advanced configuration and Power Management (ACPI) the process was completed successfully. Warning: You can do the same thing if you don't want to install ACPI and your BIOS doesn't support ACPI disable setting. Just choose the Standard Computer HAL from the list of options.

Download Software Resetter Epson L800 Free. Another method to disable ACPI is: • wait for the text-phase of XP setup to complete • before XP Setup Wizard to load, boot into DOS and change ACPIEnable = 0 from ACPIEnable = 1 in file c: txtsetup.sif The reason why ACPI is not installed on a computer with known ACPI compatibility may be a Microsoft known subtle incompatibility which can lead to hardware instability. In the installation step Windows XP checks the BIOS compatibility with ACPI and the BIOS presence on a known bad list. If the BIOS is there ACPI is not installed. Of course than errors can occur so you can force the ACPI installation (not recommended). Try disabling it in the BIOS first, this can not be done on a computer with the operating system already installed as it will cause the machine to stop.

MUST be done when you initially install the OPERATING SYSTEM. Nov 16, 2008 . Epson Stylus Cx2800 Scanner Driver For Win7 there. The wireless is not going to turn on and off via the switch properly until we get the drivers loaded to make it work.

There are 3 possible types of wireless card it could be, so we have to find out the exact model number of your system. Hp Quick Launch Buttons Download Win7. On the bottom there should be a label that has a P/N or part number listed. What are those numbers. Here's an example of the label: or we need the info listed for #1, #2 and #3. Then we should be able to determine which adapter you have, and then we can (hopefully) find some Windows XP drivers for you.

Feb 26, 2008 .