I have a Sony Vaio Desktop I was changing from Windows 98 to Windows XP. System crashed have way through due to power outage. When I tried to restart the PC, I got the error message "Error loading operating system" The prepost screen shows all the hardware. When I try to boot off the CD/DVD drives with the Windows disk or any other bootable disk computer does not recognize the disk being there. I have the Biios set to read CD/DVD drives first and then the hard drive. Any suggestions