1. Download the ExifTool by Phil Harvey (Windows Executable)
2. Unpack the file “exiftool(-k).exe” somewhere (e.g. to “C:\”)
3. Rename the file “exiftool(-k).exe” to “exiftool.exe”
4. Open “Start” > “Run” and type “shell:sendto”
5. Create a new Shortcut via right click: “New” > “Shortcut”
6. Select the “exiftool.exe” in the correct folder
7. Change the path to look exactly like this (except for the folder of course)

   C:\exiftool.exe -d %Y_%m_%d_%H_%M_%S%%-c-%%f.%%e "-filename<CreateDate"

8. Give the Shortcut a name (e.g. “Rename to EXIF-Date”)
9. You can now select JPG files or entire folders in the Explorer and rename them automatically via right click: “Send To” > “Rename to EXIF-Date”

Simple, isn’t it?

P.S.: If you want to change the format of your output date format, here is the reference for the parameters: http://www.sno.phy.queensu.ca/~phil/exiftool/filename.html#codes