If you have sufficient HD space, make an XP 32bit partition and use a boot manager. Or install on an XP rig, once working copy the dir to the new rig and test.
Make sure the executables properties, (gp4 & gpx) are all set to XP SP2 or 3, set cpu to 0 in gpx and verbosity to high so an error log is created on a crash. Run the execs in admin mode. Test. Report.
[
www.mediafire.com] Some say you should click it, you know you want to.
[
www.gp4central.com] <----GP4 Central