Sometimes, a device won't load until the computer is rebooted/restarted. I used to have that problem until I went into the BIOS and changed a few settings. The next time Windows loaded, all my devices worked as soon as they were plugged in! I did not reload or reformat my hard drive, I have found that if the BIOS has an option for "Plug n' Play OS" and it is disabled, nothing that is plugged when Windows is on will work until Windows is restarted. So just make sure your laptop is Plug n' Play enabled or on (or something similar).
Just my two cents...
Kyle