WPT installs the MSI file in "C:\Program Files (x86)\Windows Kits\8.0\Windows Performance Toolkit\Redistributables\" use the WPTx86-x86_en-us.msi and perform an admin install, copy the folder to XP and run it their to capture the trace.
"A programmer is just a tool which converts caffeine into code"
I tried extracting this WPTx86-x86_en-us.msi, but when I tried to run xperf, it is saying not a valid win32 application even though it's the 32-bit version.
I confirmed it's the 32-bit version by running filever.exe xperf.exe and it returned the following (W32i means 32-bit)
--a-- W32i APP ENU 6.2.9200.16384 shp 369,608 07-25-2012 xperf.exe