Well this seems a bit strange, my windows xp loads absolutely fine when my both optical drives are connected but as soon as I disconnect them it says "error loading operating system". I have also checked and changed my bios feature boot option and selected my HDD as the first priority but still it seems there's no change. I have 2 optical drives one is SATA and the other is IDE cable. In any of the case if one is disconnected the "error loading operating system" message flashes. I don't know what is wrong. Also when both the optical drives are connected and using my "boot menu" if I select my HDD to boot first it works fine again...what is happening on disconnecting the optical drives??? Please Help!!!