This interface it's much better than the current one which outdated.
I like your interface it's simple and informative.
I just have some suggestions, you can move the update now button under the 3 security components or make it a little bigger if you want to keep it where it is.
My other suggestion is to give options in the area << Search for virus now>> like quick or full search.
Since the update now button is large you don't need to move it.
If you want to put it under the 3 security components you can do a little trick.Put the full scan button under the quick scan so this part of the interface will be a little longer and then you can put the update under the 3 components and it it will be in the same straight line with the full scan.
I hope i have helped