the external hard drive is recognized as Drive "E" but used to be Drive "G"

[marthaj]

Now that it is drive "E", it won't open the files,

 

[Karsten75]

http://www.sevenforums.com/tutorials/82994-drive-letter-add-change-remove-windows.html

 

[Mighty_Miro_WD]

Hi.
Sometimes the letter, which was assigned to the disk, changes. That can be easily fixed by assigning a drive letter manually in Disk Management - just right click on the drive, select "Change drive letter and paths" and then change and finally select a letter from the dropdown.
Cheers!