Short description of Reg Clear 2011.00216: Why has your PC suffered a decrease in performance? What many consumers fail to realize is that there is a logical explanation for the frustration they are experiencing. Almost all system issues can be traced back to registry errors. Chances are, if you're running your PC on a Windows operating system, your computer has these errors. If your computer runs on a Windows OS, you have more than a 90% chance of having multiple registry errors.