If the CSISYNCCLIENT.EXE process is using an insanely large amount of CPU on your computer and causing your computer to grind to a halt, the following are the most effective solutions that you can use to try and fix the problem:
Solution 1: Install any and all available Windows updates for your computer
Solution 2: Perform a System Restore
If installing all available Windows updates for your computer does not work or if there are simply no Windows updates available for your computer, you can also try and fix this issue by performing a System Restore and restoring your computer to a point in time before it was affected by this problem. However, it should be noted that this solution is only going to work if a system restore point was created before your computer started suffering from this problem and that all applications and updates installed on your computer after the system restore point in question was created will be uninstalled during the System Restore. In order to perform a System Restore on a Windows computer, you need to: Windows will restart and begin restoring the computer to the chosen restore point. The process may take a significant amount of time, so just be patient and, once the process is complete and the computer boots up, check to see whether or not issue has been resolved.
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