[Cory]

You can get Solidworks for free as well, but if your computer can't handle Inventor it's not going to run Solidworks much better.

What are the specs on your computer? 6 or so years ago I was able to run Inventor 8 without much trouble on an 800 mhz P3 with 128 mb of RAM and integrated graphics without too much trouble (until I got into large assemblies).

Most relatively new computers should be able to handle light duty CAD work using Solidworks or Inventor.