You will use many different computer programs in your various chemistry courses. In addition to software that probably came with your computer, in particular, Word and Excel, you might wish to add the following to your computer:
Chime Plug-In - this plug-in enables you to view molecular structures in 3D, to rotate, examine, and render the structure in a variety of formats. In order to download the plug-in you need to register (free) here.
ISIS-Draw - draw structures in 2-D; download at the same site as Chime
Jmol - another option for viewing molecular structures; download here
Rasmol - the original 3D molecular viewer; download here
Orbital Viewer - render atomic and molecular orbitals in 3D; download here (PC only)