I have a program causing nasty ntdll.dll error messages. So I was told to reinstall xp over the previous copy. I did and lost my wireless card and slave 250G hard drive. I got the wireless card back. But the hard drive shows up in the bios and when i go into Storage management it shows up as unallocated. What happened? I was only installing software on my main C drive. D drive should have been untouched.