When I shut down my laptop I get this message and it says that memory could not be read.

You can disable dr watson, which would stop the error, found some info on other sites that may help
Some people seem to have a problem with Adobe
Users who have Acrobat 7.0 can follow the instructions on this website...
AcroRd32.exe - Prevent from staying open
If adobe seems to be a problem app, download the latest version

Here is another link with same error
Annoyances.org - dwwin.exe (Windows XP Discussion Forum)

If you Google 'dwwin.exe on shutdown' you will come up with 18,000 hits
Hope this helps, you can always disable it