Hello pablo030781
The command output reads as if your wkhtmltopdf is installed in C:\.
If this is not the case, you should probably review the $wkhtmltopdfPath in the config.inc.php file.
You can also test wkhtmltopdf is working by running the command inside cmd.exe.
On Windows, this should be something like:
C:\wkhtmltopdf\bin\wkhtmltopdf.exe www.rosariosis.org rosariosis.pdf
Note: in the config.inc.php file, use slashes / instead of antislashes \...