This little circular spinning rainbow is increasingly appearing on my iMac, especially when I have several pages up.  Sometimes it freezes or the computer closes all of the screens.  Then I need to restart.  What is this?

This little circular spinning rainbow is increasingly appearing on my iMac, especially when I have several pages up.  Sometimes it freezes or the computer closes all of the screens.  Then I need to restart.  What is this?  Do I need to buy something to clean up my computer?

Model Name:          iMac
  Model Identifier:          iMac9,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.66 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          6 MB
  Memory:          2 GB
  Bus Speed:          1.07 GHz
  Boot ROM Version:          IM91.008D.B08
  SMC Version (system):          1.36f3
  Hardware UUID:          1ECBB6EC-1FA8-5F7C-B44B-F0E0B64C9549

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