These codecs will allow you to play almost any media file extension.

This is an excellent tool if you download programs online and do not know how to run them. You can mount pretty much anything and use it with this tool. I think they offer a free lite version.

This program will defragment your computer and make things run smoother. It takes a little while but it doesn't use much RAM and works quietly in the background.

If you like playing games on the computer this shuts down all the stuff you don't need when they are running. Once you are done you just click a button and everything is back to normal.

useful collection of online tools

Allows you to use the same login for almost every website you use.