What happens when you attempt to install it? Below are some common steps
which address many of the XP install problems...
1) Make sure your cryptography services are enabled. To do this, go to my
computer | manage | services and applications | services. Then go to
cryptography services properties and make sure the service is started and
startup type is set to automatic.
2) If you are running Windows on a FAT32 drive, run scandisk.
3) Try the resolution steps in
http://support.microsoft.com/default.aspx?scid=kb;en-us;813442
4) Try the resolution steps in
http://support.microsoft.com/default.aspx?scid=kb;EN-US;822798
5) Remove temporary files in %temp% and (if installing end-user runtime)
%windir%\system32\directx\websetup