mirror problems

I am running a
pentium 4 - 3ghz
2gb ram
ati fire gl v3200 128 vidio card
and solidworks 2008 sp2
there is a problem with mirror, it crasher the machine, why. it maybe in assembly, or just components.
has anybody had the same problem.
we seem to think it may be the video.SolidworksAssemblies