error message installing Service Pack 2?

I've tried five times to install SP2, but still get the error message
"Service Pack did not install. Reverting changes. Do not turn off your
computer." I've tried to install SP 2 with the downloaded package in
addition to Windows Update and also downloaded the cleanup tool. I've
disabled my Norton antivirus program and still SP2 will not install. I
already have SP1 installed on my HP Pavillion 32 bit OS with Windows Vista
Home Premium. Do I really need to install SP2? Thanks in advance for your
answers.

Maybe the following article woudl be worth a look:

(947366) How to troubleshoot Windows
Vista and Windows Server 2008 service
pack installation issues
http://support.microsoft.com/kb/947366

Free unlimited installation and compatibility support is available for
Windows Vista, but only for Service Pack 2 (SP2).

This support for Windows
Vista Service Pack 2 (SP2) is valid until November 26, 2009.

Availability of
chat or e-mail support differs depending on your geographic location.

For
customers residing in North America, chat and e-mail support is available.

Go to
<http://support.microsoft.com/oas/default.aspx?prid=13014&gprid=582034>

& select appropriate category (e.g., Installation).

Have you tried SFC /SCANNOW?

How to troubleshoot Windows Vista and Windows Server 2008 service pack
installation issues
[Errors 0x80070002; 0x8007000D; 0x80073712; 0x800B0100; & 0x8024200D]
http://support.microsoft.com/kb/947366

If you're having problems installing SP2 *via Windows Update*, post about
your problem here instead:
http://social.answers.microsoft.com/...stawu/threads/

Post any other Vista SP2-related questions in a Vista-specific newsgroup
(e.g., Vista General) or either of these 2 forums:
http://www.answers.microsoft.com/windows;
http://social.technet.microsoft.com/...stasp/threads/

[Arnold3724]

I called them and they wanted me to put in my Windows Vista Home Premium disc and do an "upgrade" (w/ xp it was called a "repair" not a full installation), and when I explained to them that I did not have a Vista Disc and my laptop was out of warranty, they agreed to send me a Windows Vista Home Premium Disc at their expense (since it was their service pack issue) and in 7 days when I get it, they said for me to do the (repair) which is called an "upgrade" with Vista, and then follow the steps below to resolve the issues. So maybe this will help some of you as well. I hope!

According to Microsoft (at:http://support.microsoft.com/kb/947366) here is their suggested solution(s):
"Resolution 1: Install the stand-alone package for the service pack instead of using Windows Update to install the Service Pack
Note If you already tried to install the stand-alone package for the service pack, and you encountered this problem, skip this resolution and go to

Resolution 2.
If you are unsure if you tried to install the stand-alone package for the service pack, we recommend that you try the following steps to install the stand-alone package for the service pack. By using the stand-alone package to install the service pack, you eliminate installation issues that might be related to Windows Update. This simplifies the troubleshooting process.
How to obtain the stand-alone package for the service pack
To obtain the service pack, see the following articles in the Microsoft Knowledge Base as appropriate for your operating system, and then look for the option to install the service pack from the Microsoft Download Center.
935791 (http://support.microsoft.com/kb/935791/ ) How to obtain the latest Windows Vista service pack
968849 (http://support.microsoft.com/kb/968849/ ) How to obtain the latest service pack for Windows Server 2008
Back to the top
Resolution 2: Run the System Update Readiness Tool
The System Update Readiness Tool checks your computer and tries to resolve certain conditions that could interfere with the installation of updates or other software. However, before you download the tool, you have to determine whether your computer is running a 32-bit version or a 64-bit version of the Windows Vista operating system. If your computer has Windows Vista installed, and you know which version that you are running, go to the "How to download the System Update Readiness Tool" section. If you are unsure about which version your computer has installed, follow these steps:
Click StartCollapse this imageExpand this image.
In the Start Search box, type system, and then click System in the Programs list.
The operating system is displayed as follows:
For a 32-bit version operating system, 32-bit Operating System appears for the system type under System.
For a 64-bit version operating system, 64-bit Operating System appears for the system type under System.
After you determine which version of Windows Vista your computer is running, download the System Update Readiness Tool.
How to download the System Update Readiness Tool
You can download the System Update Readiness Tool from the following Microsoft Download Center Web site:
http://www.microsoft.com/downloads (http://www.microsoft.com/downloads)
The following files are available for download from the Microsoft Download Center:
Collapse this imageExpand this imageDownload the System Update Readiness Tool for Windows Vista (KB947821) package now. (http://www.microsoft.com/downloads/d...0-b2903257f1fd)

Collapse this imageExpand this imageDownload the System Update Readiness Tool for Windows Vista x64 (KB947821) package now. (http://www.microsoft.com/downloads/d...0-1fe9a4bfa44d)

Collapse this imageExpand this imageDownload the System Update Readiness Tool for Windows Server 2008 (KB947821) package now. (http://www.microsoft.com/downloads/d...0-b2903257f1fd)

Collapse this imageExpand this imageDownload the System Update Readiness Tool for Windows Server 2008 x64 (KB947821) package now. (http://www.microsoft.com/downloads/d...0-1fe9a4bfa44d)

Collapse this imageExpand this imageDownload the System Update Readiness Tool for Itanium-based Systems (KB947821) package now. (http://www.microsoft.com/downloads/d...4-237b75e05bf6)

After you download and then run the System Update Readiness Tool, restart your computer. Then, immediately try to install the full download package for the service pack that you previously downloaded from the following Microsoft Download Center Web site:
http://www.microsoft.com/downloads (http://www.microsoft.com/downloads)
For more information about the System Update Readiness Tool, click the following article numbers to view the articles in the Microsoft Knowledge Base:
947821 (http://support.microsoft.com/kb/947821/ ) Description of the System Update Readiness Tool for Windows Vista and for Windows Server 2008
Back to the top

Resolution 3: Close or disable any applications that may be running, restart the computer, and then install the service pack
Important These steps may increase your security risk. These steps may also make the computer or the network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommend the process that this article describes to enable programs to operate as they are designed to or to implement specific program capabilities. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this process in your particular environment. If you decide to implement this process, take any appropriate additional steps to help protect the system. We recommend that you use this process only if you really require this process."

IF ONLY WE HAD THIS NEXT INSTRUCTION BEFORE DOWNLOADING AND INSTALLING THE SERVICE PACKS TO BEGIN WITH, OH HOW MUCH EASIER OUR LIVES WOULD HAVE BEEN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

"During installation, one of the most common causes of failure occurs when a third-party application holds open a file or locks a file that the service pack installation program has to use. For example, a third-party antivirus or antispyware application may cause this problem. To minimize this possibility, follow these steps:
Close all applications, and then restart your computer.
After your computer has restarted, disable any antivirus or any antispyware applications that may load during the startup process. You can usually disable the application from the notification area. This area is located in the lower-right corner of the computer screen. To disable an application from the notification area, follow these steps:
Right-click the icon of the third-party program.
Click Close, Disable, Exit, or a similar term from the list of options. If these options are not available, you may have to open the application and then close or disable it in the application.
As soon as you close the antivirus or the antispyware application, try to install the full download package for the service pack that you previously downloaded from the following Microsoft Download Center Web site:
http://www.microsoft.com/downloads (http://www.microsoft.com/downloads)
After you have completed the service pack installation, enable the antivirus or the antispyware application that you disabled in the previous steps."