There is a bulk file rename windows software: Rename-It. There is also portable version at Portableapps. The interface of this software is simple. You can drag drop files to the list or click add files, add folders.
drag drop interface
The software rename using filters. We start by click Add filter. The filter menu appears. We can choose to use “Search and replace”, Case filter, Crop filename, ID3 reader
Using crop filename is simple. You can choose crop from left side or from right side. Number of characters you want to crop and starting point. the preview is really helpful. You can see how the filter affect your filename.
crop file name
Choose search and replace if you want to replace a string in filename with new string.
search and replace
You can add multiple filters. Use up and down button to change the order of filters
Case filter can help you change case of characters in filename to: UPPERCASE, lowercase, Sentence case (capitalize),Word Case or iNVERT cASE