Can't start up after forced shut down during update.

First off, let me say that I realize that turn off my computer during the update configuration was a terrible idea.Anyway, there isn't much I can say besides that my computer just won't start up. I've tried safe mode, I've tried system restores, but they both failed. I'd supply you with crash logs, but I'm not entirely sure how.All attempts at a system restore failed and came up as an error, and when I tried to do a disk check, it said my disc was write protected.Let me know if there is any more information I can supply.

What happens, exactly, when you try to boot.

The steps you have taken so far, like chkdsk, exactly how did you try that, for example, are you using the F8 Key to use the recovery options or booting to a install DVD or Recovery CD? Do you have an Install DVD or can you download and burn one?

What type of computer?