lets stay calm about this... good job on posting it btw, I do nto respond to PM's regarding problems that can be better time spent posted andhelp a community of people rather than indiviually.
Go into the device manager, delete all optical and hdd, then also delete all ide channels, then restart. Hit F8 and go into saf emode, repeat the process, delete all the same stuff, then restart the PC again, go into BIOS and make sure everyhting is detected and set to DMA mode, then restart one last time normally and let windows detect everyhting from scratch, if this doesnt help, you will need to do a system repair.
My best offhand advice while on lunch break at work!!!