hello all, my imac has been running very slow lately and i don't know why. i'm not a man of great knowledge when it comes to computers and in fact this is my first imac i've ever had. (although i loved until now.....) i need to know what i can do to make it run faster. it seems to only be a problem when i'm on the internet although i could be wrong. (i know it is not just a connection issue because my ipod touch is running off my wireless much faster than my computer. so if you could help it would be fantastic.