You could either try to uninstall Inkscape and install it into a differently named directory (using a name without special characters) or try a recent development snapshot build (be sure to unpack it into a newly created directory).
I explain : i installed Inkscape on my second hard disk (D:), but as you advised, i uninstalled the program and installed again on the Hard disk where windows is installed (C:). Now i have all the icon, that's wonderful !
Thanks you jmx and suv for your help, and have a nice day