RE: Deleted Fixed Asset by error
Rachel,
Deleted fixed assets can be added to the system again. Make sure you duplicate the setup of the deleted asset exactly. Once you've recreated the asset, depreciate it to it's depreciated to date again, interface to GL and delete the batch from the system. Don't post the batch to the GL (the entries are already in the GL, as deleting the asset does not remove entries from the GL).
Make sure you clear out any other GL entries you want to keep, in order to make sure you can cleanly delete the GL Batch created by the GL interface.
This approach has worked for numerous clients on assorted versions of GP. I would recommend trying this in a test database, copied from your live company, to make sure it is going to work as planned.