Software hangs on "enumerating devices"

I am running ver 6.7.28.7 automotive on win xp ver 2002 sp3 .
The startup screen hangs on the enumerating devices screen and won't shut down . I can run beta version 6.7.2.1 with no problems , even with the 6.7.28.7 screen still showing. changing usb ports makes no difference and i have removed and reinstalled fresh downloaded software - the earlier versions seem ok.
If anyone can shed some light on this i would appreciate it.

Please try 6.7.35 which addresses this issue https://www.picoauto.com/download-software.html