These are often critical Windows errors usually caused by a corrupt registry entry. To prevent further corruption to other hardware and applications on your PC, this error should be fixed immediately. Risks that can result from not repairing this error include system crashes, blue screens, and hardware failure.
Atapi.sys error symptoms can include program lock-ups, slow PC performance, system freezes, shut down and startup problems, and installation errors.
Fixing the Problem
Atapi.sys errors are easy to repair. By downloading and running the registry repair tool PC Cleaner, you can quickly and effectively fix this problem and prevent others from occuring.