How to login to 3COM 3C17304 Switch?

I recently picked up a 3COM 3C17304 Switch at a local auction. I fired it up and it turned on and seems to be working correctly. However all of the 24 ports are on the same LAN. I believe this switch is capable of multiple VLAN's so I want to set some up. This is were I'm having the problem. I need to use the web interface to do this, but this switch was owned my someone else before me and the default login and passwords dont work. I need to know in plain english how to reset this 3COM switch back to its factory settings. Please be specific with step by step details. I am not a programer so if there is a simple way to do this that would be best. Thanks so much.