It is difficult to give a clear advice over an unclear question. Help us which way.
"I have this Debian KDE image and I want to reformat my Flash
drive with this one,.."
So, formatting it "with that one" presupposes you have first installed the image and got Debian running. Right?
...but I don't know how to do it on Windows. Can someone tell me
the who'll procedure!?
Now, you want to do it under Windows? By the way, in this forum, as far as I observed as I am also new here, the word "Windows" generally means the one by "microsoft" not the "X windowing system".
Debian system installs to Linux partitions like ext2, ext3 or ext4, or maybe raiserfs (i havent tried this latter yet); and these partitioning cannot be done under Windows, this system by microsoft cannot read those partitions or cannot even see them. Much the more you have no way to install it there.
Or, if you wanted to install a GNU/Linux OS via a running Windows system (say, an XP) you can do it by downloading "wubi" a windows installer for Ubuntu, and from your Windows platform run that exe, you will need to be online. it takes time to prepare your drive and download files from the web. The installer will only need two answers from you but be sure to record --don't forget-- your user name and password. When pc reboots it will take you to the login prompt of the new linux system. Don't worry, this installer will not destroy your windows, you can boot again to xp if you want after that, with all your files safe-same. Only that you must have enough space, about 3Gb on the harddrive before installation.
We got to learn to crawl; before we learn to walk. --steven tyler