To find out for sure if your PC has or han't got a firewire port already:
Open 'Control Panel'
Double click the 'System' icon
Select the 'Hardware' tab
Click on 'Device Manager'
Now scroll through the listing of devices and see if you can find anything listed as 'IEEE1394'. If you find this then that is a firewire port, if not then you don't have firewire.
If you need to add firewire then you can get a PCI card & cable for approx £10 that is dead easy to add to the PC as long as you have a small amount of confidence or knowledge of PC's.
Once you have firewire then you can use the free Movie Maker 2 software that is part of Windows XP (if you have XP that is). It can do a lot for a freebie, and help on how it works can be found
Here.
Mark.