Where is bitcoin-qt's blockchain stored in Windows 7? I need to manually resync from scratch due to a database corruption caused by windows auto-rebooting.

Where is the blockchain stored so I can delete it (and hopefuly prompt bitcoin qt from creating a new one)?

see Bitcoin QT error. How can I prevent corruption of database?
Start your client with the -reindex command-line option. This will cause the database to be wiped and rebuilt from scratch.

To answer your actual question: see the Data directory entry on the Bitcoin wiki.