I don't think the db is corrupt, try downloading it again from the apress site.
I also got problems with the database, but only with the login. I can see it and update it in the server explorer, but when I try to connect programmatically the login fails for user "sa".
Yes, I already ran the mixedmode.vbs script mentioned in Appendix B, but it still doesn't work! (I checked the registry, the key had indeed been changed.)
Can anybody tells us what to do?