Spinning pinwheel in the Mac system indicates that certain application in not responding or not working properly. If you get this problem specifically while using certain application then the problem could be with that application only. This can happen if the application has gone corrupted or it has not been updated properly, for that you have to reinstall the software which may resolve Spinning pinwheel problem. But if it still exist then the issue is with the operating system which can caused by system file corruption, hard drive not responding, system is infected by virus. In such cases the best method id to format the Mac drive and the you have to install the Mac OS X. You will notice all the other data has been deleted in the process but do not fear as all the data can be recovered by using the time machine utility which works automatically to save copy of the file in the external drive. Sometimes the backup fails then Mac data recovery software can help you to recover all you data. The software will scan the Mac drive and show all the recoverable files in the preview for you to select. It is an easy to use to software so download it now.