|"truncated" means the file's data was chopped off at some point or points because part of the data was found to be corrupted. |
If you can't open the file after it has been truncated, data has been lost that needs to be there in order to open the file.
Whatever data has been chopped off does not show up in the Recycle bin, and data lost that way usually cannot be restored by loading a previous retore point in System Restore .
You could search on the web or on the Microsoft web site on the pages where the support for Word is using something such as: repair Word 2000 file, but even if that results in you being able to then open the file, it's contents will probably not all be there.
"...the computer shut down ..."
Describe exactly what happened.
E.g. did the computer black screen or blue screen before it shut down?
It's possible your hard drive is failing.
Check your hard drive with the manufacturer's diagnostics.
See the latter part of response 1 in this:
(thanks to Dan Penny for this link:)
Hard Drive Diagnostics Tools and Utilities
If you don't have a floppy drive, you can get a CD image diagnostic utility from most hard drive manufacturer's web sites, but obviously you would need to make a burned CD, preferably a CD-R for best compatibilty, on another computer if you need to.
If the hard drive itself tests okay, any data problems found can be fixed, one way or another.