After Uninstalling bootcamp issue

I've just uninstalled bootcamp and deleted the windows partition, as i've decided to run in parallels instead. However, now that i've done that, when I boot up, right before the apple logo shows, there's a picture of a harddrive with a question mark on it. it's only there for about a second, but I was wondering Iif I could get rid of it. It wasn't there before.

Also at the moment os x seems to be running slower, almost as if parallels is eating memory when it's not running? Or could it be now that it has 20gb more free space again (woo ) , that it's indexing it again?

any help appreciated!