Try this link here:
http://kb.sandisk.com/app/answers/detail/a_id/10/~/cruzer-flash-drive-not-detected-by-windows-pc
When my system would not recognize my ScanDisk, I follow the instructions here. If you right click on the exclamation point or question mark and do an update driver, and choose either your PC or online to search for a driver. It worked for me.
Pat
