Switch/Network locking up !!!

Hi,
 I have two (SR2024) that are connected to each other and feed about 44-45 workstations. My main Server (Windows Small Biz Server 2003 ) is connected to one of them of course that feeds both Switches and all the workstations with Internet and file sharing and logins ....etc . Every once a while the network freezes and I wont be able to accees anything. Any Idea why ?! Could they be overloaded or maybe one of the workstations computer with a bad ethernet card that is causing the whole problem or freeze up ?! please do advice how to diagnose or what to look for first ... I also checked the Event Viewer on the SBS 2003 and didn't see anything suspicious around the time it went down or froze , so i'm clueless .. do advice plz.
Thanks

There is possibility the one of the switches may be defective. Check also if the switches have redundant links. These aren't managed switches so they don't have STP. Though it is just a network of about 45 computers, try testing your network with around 20 computers. It might be possible that your network is not able to handle the broadcast from the current number of computers that you have.

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