There is always a chance the left click button has stopped working. If it has, might be electrical (switch related) or some debris might have gotten under it. If it thinks it is always pressed, that might effect some actions.
For the pad, on my system in Control Panel, mouse, I have a tab for the Dell Touchpad which gives you the ability to change the buttons. You found the same type of thing for the ALPS pad, but it may not have the same options.
Going into the Device Manager, you might be able to update the driver from there. If that won't work, you might try uninstalling the touchpad and letting windows find it again.
Why you cannot move the files, I am still uncertain. If you have room on the drive, and the file is not...