It's not necessarily a "shutdown message" but any error at the time you shutdown.
Shutdown at a precise time according to your PC clock and then note the time of any errors just after that time.
Errors are not uncommon as this is the way that the so called "Microsoft Support Centre" (usually Asian chaps) cold call and get unsuspecting people to part with their money to fix these errors, which all computers will have in some form or another.
Was Eclipse Home Option 1 & VM 2Mb
Now O2 standard