About a week ago, I installed 10.04 onto my shared computer from an ordered disc and starting from two or three days ago, a bunch of problems have arisen in regards to Administrative programs not opening. I decided to check if my brother had changed my account from being an Administrator to being a General user (I don't know if that's the correct name), but when I click on Users and Groups, an error box pops up saying that "The configuration could not be loaded" and "An unknown error occurred". As the topic title says, the Synaptics doesn't open either. I've tried installing things from the Ubuntu Software Centre, but that doesn't work. I can open the Update Manager, but clicking on "Install Updates" doesn't do anything except pretty much refresh the Manager. My brother says that the same things are happening to him and his account was created as an Administrator as well. Also, when Shut Down is clicked, the computer simply logs off, then it has to be manually turned off, and my external hard drive isn't being detected. Finally, I've been considering just reinstalling from the disc if none of this gets fixed. Does anyone know how to solve these problems, or should I just reinstall?