Imac Freezes after leopard

[krbmedia]

I did an erase and fresh install of Leopard on my 24inch white iMac intel. Now every once in a while it freezes up and I have to use the power button to shut down and restart. The weird thing is the mouse still moves around but every thing else is frozen. Any ideas or suggestions?

[Satcomer]

Well download the either the maintenance programs Yasu or Onyx and run the cleaning programs, restarting the Mac twice to rebuild the shutdown and startup cache.