frakaluken
you cannot convert the PS files to SCH in orcad directly or indirectly, as these files dont have any CAD data, like pin no, etc. so no such things can be done.
one way is to redraw the sch again just looking through it.
regarding the layout
if u have the dxf you need to convert to gerber.
u will need the nc file too. else u have to generate this again.this is big process ,and u cannot get 100% success
it is better to rework if the placement and other restriction are not much important.
Binu G