There are many tools on the market today for conducting computer forensics. Many can cost you several thousand dollars, and then you have to pay a renewal fee to get updates.
I am a firm believer in not re-inventing the wheel. If there are options out there to get the job done and it is free, then why not use it. The catch to doing computer forensics is the art of collecting information without altering the data. There are tools for this also but we will talk about those later.