Thanks very much for the reply and attention
I just want to share this ,i found is in microsoft product help website.
The Windows Installer Service could not be accessed.
This can occur if you are running Windows in safe
mode, or if the Windows Installer is not correctly
installed. Contact your support personnel for assistance.
This issue may occur when in the following conditions are true:
You are using Windows XP in Normal mode.
The Windows Installer Service that is included with Windows XP is unregistered or damaged.
To resolve this issue, follow these steps:
Log on to your computer as an administrator.
Click Start, and then click Run.
In the Open box, type cmd, and then click OK.
At the command prompt, typemsiexec.exe /unregister, and then press ENTER.
Type msiexec /regserver, and then press ENTER.
Verify that the SYSTEM account has full control access permissions to the HKEY_CLASSES_ROOT hive in the Windows registry. In some cases, you may also have to add Administrator accounts. To do so:WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
Click Start, click Run, type regedit in the Open box, and then click OK.
Click the following registry hive:
On the Edit menu, click Permissions.
If SYSTEM is not listed in the Group or user names list, click Add, make sure that the local computer name appears in the From this location box, type system in the Enter the object names to select box, click Check Names, and then click OK.
Click SYSTEM in the Group or user names list, and then select the Full Control check box under Allow in the Permissions for SYSTEM box.
Click Apply, click OK, and then quit Registry Editor.
Restart the computer. If the problem is not resolved, repair Windows XP. For additional information about how to repair Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
315341 How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
The information in this article applies to:
Microsoft Windows XP Professional
Microsoft Windows XP Home Edition
Last Reviewed: 11/4/2003 (3.2)
Keywords: kberrmsg kbprb KB315353
it actually works ,now i think Microsoft is a good company