How to rename all files in a directory?

Want to rename all files in a directory? well something similar can be achieved like this :

Select all the files in a folder (Ctrl+A), then right click on any file and select Rename.

And rename the file by pressing Alt+255. then press enter. All other files selected will be automatically renamed to (2), (3), ..... etc .. well u get an extra set of parenthesis in this case not exactly 1, 2, 3 etc.

But u'll see that the file which u selected for rename has no visible name. rename it to 1