misskathrene :
if i change my ram into 4 gig or more can i install autocadd? will i be able to use it without lag?
No, your CPU is still lacking.
What are you using Autocad for? Is this a paid gig? If so, then your employer should provide the relevant hardware.
If not, there are quite a number of other 'CAD' programs that are lighter in requirements. And MUCH lighter in price.