First remove the battery for 5 minutes, reconnect the battery, connect it to your pc and run the updater again. Leave it for a few minutes and it should go into recovery mode.
If not disconnect it and try a hard reset.
Hard reset:
1. Switch off the phone.
2. Hold down the following three buttons: Green (the call answer button), * button, and '3' button.
3. While holding these buttons, press the power button and switch on the phone.
4. Release when the phone shows the nokia logo or shows other signs of life like the language selection screen.
If that fails to fix it try the advice offered in this post by drummer27:
/discussions/board/message?board.id=swupdate&message.id=14152#M14152If that still fails then the last option is to take the phone to a nokia care point.
Care points/service centres and repair info:
UK • Europe • Asia-Pacific • USA •
Canada • Middle East and Africa
Elsewhere: Click here, select your country, go to the support section, then select repair.