I have CorelDraw X4 suite working ok in 64 bit Vista (except it will not open pdf files).

If I update it with sp1 it will not open and comes up with a runtime error.
The same happens if I try to update with sp 2.

When I used X4 with sp1 in XP with it worked OK (I could also open pdf files,)

Any help appreciated or do I have to revert back to the original.