Once I turned the computer on I got the following message: Windows couldn't start because the follow

I just downloaded Microsoft Office 2010 Professional then powered down the computer with an XP operating system. Once I turned the computer on I got the following message:

Windows couldn't start because the following file is missing or corrupt

System32DriversNtfs.sys

You can attempt to repair this file by starting Windows Setup using the original Setup CD-Rom

Select 'r' at the first screen to start repair.

Next, I started the computer with the Original Setup CD and hit 'r' as instructed. Then I got this message:

1: C:WINDOWS

Which Windows installation would you like to log into?

(to Cancel, press Enter)

What do I put here?

View this thread