Honestly the manual that came with it explains this pretty well if you actually read it. I know nobody reads manuals but for once it's worth flipping through. The troubleshooting section in the back covers the most common problems.

I've been using computers since the early 90s and the answer to this has changed dramatically over the years. Right now, the best approach is to use open source alternatives when possible — they're usually free and often better than commercial products.

This is actually a really common misconception. The technology works differently than most people think. I'd recommend reading HowStuffWorks.com for a good beginner explanation before diving into the technical details.

I posted this exact question on a newsgroup a while back and got a ton of helpful replies. Don't sleep on Usenet — comp.* groups are full of people who actually know what they're talking about, way more than some web forums full of script kiddies.