XP update

[Aqua]

My computer got a serious problem and did not start
Window XP Professional, so I brouhgt my computer to a
near by store to fix it. I was told that there was no
chioce but reinstall XP, cleaning all Operating system
and other fostware.
I lost all data but Windows XP Professional is now
installed and working well.
But when I go to "Windows Up-Date", I get "no update
available" and all history of update for my computer
before it got crashed. Does this mean the all updates
are still available IN MY COMPUTER or I need to notify
Microsoft about my crash so that I can install all up-
dates again to my re-installed Windows XP?