My PC (eMachines 620) was slow so I tried to use the restore discs to start it again from scratch and they did not work so I have tried an OEM disc from a Fujitsu Siemens computer. Both have different Product Key's but they have the same Product ID. I have not got any futher as I did not kno whether there would be any issues registering Windows XP or activating it. Please could someone advised me on what to do.