Try Paessler's Webstress. The free trial version simulates one to 10 webusers, who click about once every 2 seconds (if you choose random click delay. Run several instences of the program from several machines, and you'll get plenty of load.
http://www.paessler.com/WebStress/webstress.htm
cheers
General help
Windows server: Load testing on windows server
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