programs dissapeared from menu


In Runtime
I was downloaded a large file yesterday and my laptop restarted half way through and when it came back on I noticed when I click start->programs most of the programs were gone.

The shortcuts of the programs that are gone are still on my desktop so I know there still on the laptop and work fine but just have dissapeard from the programs menu.

Accesories, IE, outlook, WMP and some of mine are still there but there is loads thats vanished including my own software and some that were pre-installed.

I used system restore to go a few days back but there still missing.

any ideas whats going on?