You should run a DBCC CHECKDB as soon as possible. SQL Server is often times able to recover using one of the repair parameters (REPAIR_ALLOW_DATA_LOSS, REPAIR_FAST, REPAIR_REBUILD) for CHECKDB. The results of DBCC...
To rule out any SQL Server issues, you may want to upgrade to the latest service pack (SP3a). Also, you may want to try and close and re-open the access...
Use textimage_on for your table(s) containing the image columns holding the scanned documents in order to specify that the image data go on a separate file...