You can't, it means that the computer is lagging and it can't keep up with whatever you're doing.
I am unsure of the model of your computer. If it is an apple PC then the rainbow icon is telling you that you have updates for an application. If it is a Mac PC then you can get rid of it by pressing control, alt and delete.
It is not possible to get rid of Key Items such as Bicycle and Rainbow Pass. Also, if you "got rid of" it then you would no longer be able to go to the Sevii Islands, and do you really want that?
well they do not try to get rid of rainbow fish they sell them alot because they are worth alot of money
The rainbow cursor of death.
to quit instalationalert window on mac mavericks
throw it in the dumpster
You get the rainbow wing from the radio tower director after you get rid of team rocket. (Same thing in soul silver).
you pug in another Mac Os using a cord( don't know which) and you can over rid it
just get there by takin' bens rainbow
maybe its the narattor of your mac.check it
You must tell us what the "thing" is so we can help you remove it.
The Big Mac is a trademark that helped make the McDonald's image. Therefore, it is extremely unlikely that it will ever go away. It is just a rumor.