Help with Mission builder

[urlybird00]

Hi , all , ive been working with the mission builder with reasonably good results , apart from a mission i built last night , every time i try to fly it , i get half way through and my p.c locks up, Ok so i put 8 flights of 8 a/c into it ,Now i know this may be my fault as my p.c only has a 64mb video card, 2.5Ghz P4,256 RAM, i was wondering if any one else with a similar set up has experienced this problem, or if there is someone out there with a bigger spec p.c who'd like to test it out for me,
If so drop me a line to  " urlybird0@hotmail.com " , and i'll forward it to you , many thanks