OK, good to know.
One useful thing I like to do whenever I start down one of those paths of tweaking my computer in a "new" way, is to keep a document of what I did. Open up your favorite text editor (I like Textpad), and just copy/paste the tips you've executed, in the order you did them. Also, preface this with the date so you can remember when you did this. I also like to copy/paste the links to website pages where I got them from, for future reference. This way you can look back over what you did recently when things start acting up, and see if it may be something you did that introduced the problem.