The batchfile is used to register the required DLL files
copy and paste this into notepad and save it as "pol.bat" or something similar, making sure to get the .bat filetype extension
Code:
FOR /R %%G IN (*.dll) DO regsvr32 /s "%%G"
Stick that in your pol folder and run it from winxp.
You might have some trouble since win7/vista has a different POL version for the OS, idk if it'll run in xp. I'm not sure if it'll work, but after transfering all the files, maybe try installing xp pol ontop of the folder (make a backup just incase it doesn't work)
For the registry stuff, export the tree [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\PlayOnline US] from win7, then edit it with notepad deleting every \Wow6432Node section in the file to make it look like HKEY_LOCAL_MACHINE\SOFTWARE\PlayOnlineUS save it and run from winxp. Of course, change US to EU as needed