some insight on what could be happening is that your drivers for your cd rom device work but only to an extent, sounds like your drive is giving up, try uninstalling it from the device manager, restart your computer and let windows detect and install it, hopefully this should fix it. if not, as long as you have the discs, you could (and in no way am i endorsing this) use a no-cd crack, this should only be used as a last resort, i shall not tell you where to get them because no-cd cracks are most commonly used for illegal versions of games, i shall not be a part of illegal distribution. And most No-cd cracks are viruses.