Icaros

I don't have to use the cluster for gaming(and probably won't much) but I need it to finish my college design program. Please advise on software.

I don't exactly have the money to make a godly PC/Gaming Platform, that's why I would like to use what I have. What would be the best software to use for deviding the load? Also, do I need additional hard drives, or does just the one in the control work?

I have recently come into the possession of 4 Think-center M58P 6234-UV1. I would like to link these together for multiple uses(gaming, Rendering, etc.) and don't know where to start. Between the 4 Comps there is currently only 1 1TB Hard drive(purchased comps from Gov) Currently installed Windows XP on hard drive and probably upgrading to windows 7 ultimate when I can get $140 and get to the university(Yay student discounts!). Also have a HP Pavilion dv6 w/ windows 7.(If that makes anything easier.)