Snort windows collect little than snort linux

[dogfart big <dogfartbig () yahoo com>]

I install snort on win2k with winpcap and snort on linux with same rules.
 
When I start retina to scan machines I get a lot of log messages RPC, WEB-CGI, Front page and lot lot of attacks..... 
 
Do the same with snort on windows get the 3 allerts all (http-inspect)
 
What is the trick?
 
THANKS FOR HELP!!!! 

                        
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