Whoops... i could help you with a mac, but no-can-do for windows.
Here's a tip though... I bet you can right click on any of your presets in LR and say "find in windows explorer" or whatever it's called, then you will see the directory where your presets are. You can put any new presets in the "user presets" folder or make your own folder. They'll show up upon restart of LR... assuming that it works somewhat like mac