Windows failed to start . A recent hardware or software chagne might be the cause. To fix the problem:
1. insert Windows installation disc and restart your computer.
2. Choose you language and click next.
3. Click repair your computer

Other options
Safe mode
safe mode with networking
safe mode with command prompt
Last known good configuration
Start windows normally.

I have done the first option and it just says if the errors were fixed correctly then windows should start normally.
All the other options just load and super fast blue screen flashed and then it reloads everything.
It is a dell inspiron 6400
I am running windows vista home premium 32bit