I am trying to run the Pro-E tryout edition on my PC, it is new it has no viruses. It is a 3.2 Ghz Celeron chip with 512 MB of RAM. I would think I would have enough horse power to run the software but it runs very chopy. Sometimes the whole drawing area/ model is not visble or there will be a black spot where a dilog box was after it is closed. I have a 128 ATI Video card in the machine now but obviously that is not enough. Can anyone help me with this. Do I need more RAM? a bigger VC? Any suggestions?