747-400 Not CTD but Freezing

Hi all,I have read the forum notes on the 747 CTD problems. Not sure if this one will help or if you can solve it. I have only just bought this aircraft so I think I have the lastest installer.Here we go,I start FS, load FS standard 747-400 (awfull) load my flight plan, weather (real world (NOT static)) and hit fly now. Once all is up and running, I then change to the Queen. During the setting up, my PC will freeze and the only option is it hit the reset button, re-booting and starting again.Now I think I have solved the above. I changed the real world weather settings to STATIC, and no more problems...... Until now.I have just compleated a short flight from Dublin to Birmingham, with no problems at all, landing OK taxi OK (now I have worked out the steering problem, didnt read that you need to disconnect autopilot for the nosewheel and rudder to work??) Shutdown OK. So I start shutting down all the systems so I can save the panel state, got to the IRS switches, switched 2 off and on switching the third off instant freeze.I think this is as accurate as I can make it, but if anyone has any questions just ask.Thanks for a fantastic product, I have both 737 versions and am now an avid fan of the PMDG products, one request though, PSS have realeased an inbuilt weather radar, any plans???Thanks allDaniel SladeBAW1181