Welcome to the forums!
You can upgrade to a different version of the 4.5 OS, or try wiping your device and re-loading your current OS-the link below should get you started on that.
It sounds as though you may have used your Berry during the install process, and possibly unplugged it from the USB before it was complete. It is typical for an OS upgrade to take 45 minutes or a little longer to complete fully. It is recommended that the phone not be used until the upgrade has completed.
It is aslo a good idea to back up the data currently on your Berry using the Backup and Restore option on the Desktop Manager.
Good luck!
How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ