I have an HP Pavilion laptop and have the built-in mouse buttons set left-handed. If I "sleep" the computer and come back later, the buttons will have switched themselves and I have to go into the control panel and switch them back. If it is set "left" in the panel, I have to choose "right" to have them set for left; if it says "right" I choose left; either way, whichever way things are set in the control panel, I have to reverse it to get back to a "left" setting. This does not happen if the computer sleeps while I am using a USB mouse; only if I am using the internal mouse. No one I know has ever heard of this problem. Any ideas about what is causing it or how to fix it permanently?