Q: Error message when installing Safari on Windows xp

Hello, dtharachai. 

Thank you for the question.  Here are a couple things you could try to troubleshoot this issue.  You can try to repair the program Apple Software Update by following the first article below.  After you process these steps, attempt to uninstall this program.  If that step does not work, I have included a more in depth troubleshooting article that will help you uninstall program.  Once this is done you should be able to install Safari. 

How to repair Software Update for Windows

http://support.apple.com/kb/TA24326

"The feature you are trying to use is on a network resource that is unavailable" alert when removing Apple software in Windows

http://support.apple.com/kb/TS3704

Cheers,

Jason H.