seems Xvid4psp get's "dizzy" when the cpu is hyper threaded (lol). The same thing happened when my i7-2600k had it's HT turned on, Xvid4psp stopped working on that pc - but worked fine again once HT was turned off.
anyway, it's not really that big of a problem. It's easy to go into bios.
will just turn on HT again if I encounter a game that needs it.