I have crappy comp (see sig.), but X3 and Platinum starts reasonably fast. I am not in the near now, but for sure it takes less then 30sec for moth. And that is only for the first time, next time they start faster.
32/64 and memory should not influence that part (as I understand, we are speaking about SONAR start-up, not project loading).
Some ideas:
* do you have some real-time scanner (antivirus)? It can help to let it check the whole disk once and/or exclude SONAR directories from checking. Or disable for test.
* do you have some devices which are scanned by sonar? Not only Soundcards (all), but also MIDI. You can try
to disable/disconnect them all.
* how full is your hard disk? Check there is no fragmentation. Also check performance of the whole disk to see there is no problems with some parts of it. That should have no influence in case you really haven absolutely no disk activity (HDD led is not lighting/blinking at all).