you should not need to change permissions through a PHP.ini file.
the error you are reporting:
Warning: mkdir() [function.mkdir]: Permission denied in D:\Hosting\5320810\html\WA_DigitalFilePro\HelperPH P.php on line 30
is saying that the permissions are not sufficient to make the upload director. DFP will only try to create the upload directory if it does not already exist.
If you create the upload directory on the server before trying to upload the images, you will not get this error. Please make sure the upload directories are created on the server before you try uploading images.