So, my plan is to make small thumbnails of URL's with PHP and IECapt. IECapt works well, a nice command line tool, gets the full sized image of specified URL in 1 to 4 seconds. But my problem is to execute it trough PHP. This is the code I've trying to get working:

exec('IECapt.exe ' . escapeshellarg($URL) . ' ' . escapeshellarg($Filename))

$URL is of course the URL, and $filename is a simplified version of the URL.

Sometimes I get the IECapt to snap the image(trough PHP), but it takes awfully long (30-60s), and in the end I always get a 500-error, with no error messages to tell me what's wrong. Both variables are fine, they work manually with commandline:

IECapt http://google.com Google.png

My server set-up is IIS7 and PHP5.2.9, if relevant. (Windows Vista, all on my personal computer, so full access.)

Any ideas?