i installed backtrack4 2 weeks ago,it gives me problem such as a black screen after startx,unequal screen resolution,lags like hell etc,but when i run the same backtrack copy in my oracle virtual machine,it works like a charm,how can that be possible? :P i mean cant we have the same performace when i run/boot it directly from my hardisk?

Here are my system resources:

vendor_id : GenuineIntel
cpu family : 15
model : 3
model name: Intel(R) Pentium(R) 4 CPU 2.40GHz
stepping : 4
1 gb ram

Kind Regards,