You can leave it like that.
It updates from time to time, and you can use the same installer over the current install, if you wish to update.
Thats great Dragonmaster....
Just of the subject a bit, i have just been reading an artical about what the (master boot record) is and does.
What protects the master boot record from becoming infected with a virus , would Avast 5.0 stop any virus attacks.
I have paragon backup and recovery, installed on this windows 7 machince, and i have just created a rescue boot disk, but i am still learning how it all works.
But it has an option for correcting the MBR in case you are ever infected with a virus, but the main thing is how can you protect yourself from a virus getting there in the first place......