I recently went through this. After spending about $100 for Adobe Premiere elements 8 (which is a resource hog that runs about as fast as grass grows, even on a fast computer) I discovered that I already had Windows movie maker on my XP and Vista machines. My Win7 machine did not come with any movie making software at all. Bummer.

All things considered, if you have it, Windows movie maker is free, very easy to use, easy to figure out, runs fairly fast, and does 90% of what many more expensive programs do. At the very least it will get your feet wet. Once you start yearning for specific features that it lacks, THEN start looking at commercial software that has those features.

If your computer doesn't have any movie maker software, I think microsoft's site offers downloads of several such programs, which might be runnable on a newer machine in compatibility mode.

Also, CNET and download.com have movie maker programs available (if you trust download sites). And if you've bought a digital camera or video recorder recently it may have come bundled with a movie maker app. Check the CD.

I look forward to seeing more music videos... from you and everybody else!