Cruzer Titanium 8GB crashes Win7

You are running an app on your Win 7 machine that is conflicting with the Cruzer.  It could be Samsung’s Kies or one of a number of others.  See if this thread helps you: http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/Windows-7-Explorer-not-showing-drive-while-it-shows-in-computer/m-p/290694  It refers to several apps known to cause problems.