well, intel cards are ones that have had problems working with the winpcap network driver in the past, BUT if url snooper is picking up some files while you surf, then that is not the problem.
[can i just confirm that you are using url snooper by turning on sniffing and then browsing with your normal browser? i.e. you aren't having to restort to opening the web pages from within the url snooper window itself using the tiny "Manually Scan a URL" edit box shown at the bottom of the window in advanced mode]
assuming that's right, and that you are using snooper normally, you might just be experiencing the normal problem that flash files are sometimes not found by snooper.
do a test, start url snooper going and then open up in your browser: http://www.c-span.org/
see if you get a bunch of links, should be .rm links if you have the dropdown Protocol Filter set to "Multimedia URLs". if you do, then snooper is working as designed.