Hi, Is there a way I can use disk warrior on my iMac internal HD? It tells me that I cannot due to it being the OS HD.. or perhaps, can someone recommend an other way to breathe some new life in my computer? (24" white imac) I notice it moves a bit slowly wen opening and closing applications.. including simple ones like firefox or safari. I've alreayd maxed out the ram at 3gb. Any ideas? Thanks!