Just some technical comments on the video from me, which echo what's been said above to some extent.

1. Try and shoot a video with the light on you and not behind you.

2. Don't get too close to a mic otherwise you'll get distortion at higher volumes. The way to avoid this is to do a test run and playback before a full take.

3. It's always nice to see what the performer is doing as a whole, so get far back enough from the camera so that we can see both hands on the guitar.

4. The PC fan is indeed annoying. An independent mic and camera always gives better results but, of course, needs a greater outlay.

No comments on voice and guitar - they sound fine to me.

I use a more complex setup than you do but, if you want to see what I do - out of curiosity - take a peek at the How I record my videos pages on my website. It's rough and ready, on the whole, but the end results are reasonable! Here's a sample of the process: New Century Hornpipe.

Hope this is useful. Keep up the good work!