I seem to be having trouble clicking on things. Sometimes, I won't be able to click on anything, but my mouse moves. In order for me to be able to click on something, I have to use alt+tab and bring up another window, and then close it. Then I can click on things for a while longer. It seems to happen whenever I switch from one thing to another (ie, EoFF, Instant messanger, folder, etc.) Why is it doing this, and how can I fix it? It's really getting irritating.