Weird problem with SanDisk Extreme 64 after safately removing it.

USB Flash Drives All other USB Flash Drives
3

Check out this thread and the links within it.

http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/SanDisk-Cruzer-Blade-USB-Device-cannot-detect-properly-by-Win-7/m-p/290214#M4095

There is also the possibility Windows has assigned the same drive letter to another device.  Manually reassign the drive letter and see if it helps.