converting files from 7 to 5.1

is anyone having troubles converting protools 7 files to 5.1 files with out the computer crashing

Audio Card: HD3 Audio Interface: 192 I/O Audio Interface Miscellaneous: 192 I/O A/D Expansion Card Digidesign Software: Pro Tools TDM Version: 7.1.4 Computer Model and Speed: g5 dual 2 RAM: 4gig Operating System: osx tiger DAE version: DigiSystemINIT version: Other Digidesign and third party products used in the system: control 24 big ben clock 2 x HD 192 interfaces both with expansion cards Please give a concise description of the problem: try to convert from protools 7 to protools 5.1 at save copy to. starts to convert then black screen appears which tells you in about 5 languges to restart computer Want to convert files as to use on a os9 version 5.1.3 protools setup in foreign studio when this happened the first time i could not restart the mac had to do a full reinstall now when i atempt this procudure it gets the black screen but will start again Actions required to reproduce the problem: just have to try conversion and will do problem again Troubleshooting already attempted: have reloaded osx and protools checked disk permissions updated to latest pro tools 7.1.4 this also happens when i tried to consolidate the files as another way of exporting the files to another system hAVE CLEANED DATE BASE LIBRAY PERMISIONS ETC TO NO AVAIL

When i convert session only to 5.1 i have no problems when i try to convert seesion with copy audio files this is when the computer revs high and then crashes

this happens in all sessions but as i say only when i tick to copy audio files if you have any ideas please reply and could it be a hard drive problem memory should not ba an issue it has 4 gig ram thankyou for your reply