Urgent - Windows won't start after MBAM update

[indiemusic]

My system did an auto-update of Malwarebtyes at 1:00 AM (EST) on 3/28/09. Everything seemed fine, but upon restart, Windows will not start. Can't start in safe mode, enter setup, etc. The error says

Windows could not start because the following file is missing or corrupt:

\windows\system32\config\system

Need help fast!

[rhexs]

just repair your operating system

My system did an auto-update of Malwarebtyes at 1:00 AM (EST) on 3/28/09. Everything seemed fine, but upon restart, Windows will not start. Can't start in safe mode, enter setup, etc. The error says

Windows could not start because the following file is missing or corrupt:

\windows\system32\config\system

Need help fast!

[indiemusic]

Should add, I am using Windows XP Pro.

[indiemusic]

How to repair the OS? There is no repair disc. This is an Acer laptop Travelmate 4230, and there is supposed to be a built-in repair function. Yeah right. I did have a backup DVD I made when I bought the computer... but the computer seems to ignore the DVD when I load it or start with the DVD in. There's just some text on a screen stating the original error.

Perhaps you know a wy to repiar I am ignorant of?

Thanks for your response.

just repair your operating system

[exile360]

You may have to press a key or change the boot order in the bios for it to boot from the dvd drive instead of the first hard drive. For your repair options have a look at this MS knowlegebase article.

[Mad Dog Vee]

[duplicated E360's post above - wasn't necessary]

[tango54]

Press Alt-F10 as soon as you get the ACER splash screen.