To increase 150-200 concurrent user connection

hi ,,

on windows server 2003 i have configured apache 2.2.11 , php 5.1,mysql 5.0
(WAMP) to run a single website.
Now i want to increase the no. of concurrent user connection to 150-200.But for default setting i am not getting the concurrent user connection more than 30 .Even the default for apache it is 100.Also in httpd.conf file (apache 2.2.11), there is no setting for prefork or worker or winnt.


Memory Statistics
Total Physical memory: 3488927744 bytes (3.25GB)
Available Physical memory: 2562899968 bytes (2.39GB)
Total PageFile size: 4294967295 bytes (4.00GB)
Available PageFile size: 4294967295 bytes (4.00GB)
Total Virtual memory size: 2147352576 bytes (2.00GB)
Available Virtual memory size: 2117410816 bytes (1.97GB)


can you give your suggestion to increase it or any kind of solution that what else is stopping the user to connect...............