My sister recently tried to install a dvd player into her computer, she had trouble gettin it to be compatible with her system so she downloaded some drivers for it and then was prompted to download directx 9. she did so from the mircrosoft website and then was told to restart her computer. after doing so her computer will not reboot at all past the windows 2000 loading screen, not even in safe mode. She's using an older system but one that should still be compatible with directx 9, any suggestions?