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@TheShipwright
If its a duplicate IP Windows should tell you.
Reboot your router and when up reboot PS3 and your PC.
When it's all working drop into dos and do a "apr -a >arpGOOD.log" to record the MACs of your PC and PS3.
The "arp" table shows you all the devices it knows about on your network, incl MAC and IPs.
It will show all wireless devices, printers/smartphones etc.
When it goes wrong check it again with "apr -a >arpBAD.log" and then compare the GOOD and BAD logs.
If you only have 2 user devices (and a router) and nothing funny going on these MACs should be the same.
It's possible but unlikely that someone is nicking your broadband and could potentially also be (although more unlikely) spoofing your MAC address. I imagine your MAC will also be printed on the PS3 somewhere.
If it's not someone nicking your broadband, then it sounds like there's something wrong with the DHCP setup on the router.