I absolutely hate this damn software - I would rather carve the parts I need into solid granite with a toothbrush - it would get done faster!  I have major issues with weldments that others in our office do not have.  Even with small files when I try to edit a sketch or modify a Trim/Extend, anything like that, my system just freezes.  The control panel shows my CPU at 100% and the most common message that I have ever seen, millions of times every day, "SOLIDWORKS NOT RESPONDING".  Any ideas before I see how well this thing bounces from the 15th floor of this building???