The file f45b_p.dll is a component of DVDXCopy from 321 Studios. DVDXCopy was banned from sale in 2003 because it breaks the encryption on commercial DVDs to allow users to create copies of those DVDs. The creators, 321 Studios, went out of business in 2004.
Unofficial copies of this software are still in circulation, but some of them have been infected with spyware or viruses. If you have this file on your system, you should run a virus scan and check for spyware.
You can run a free scan with SpyZooka to check for spyware on your system. If you know the copy on your machine is legitimate and want to fix an error with this file, you should clean your registry with ZookaWare PC Cleaner.
Every file installed on your computer has an entry in the registry database, an information booth for Windows. If an entry is incorrect, Windows won’t be able to find and use that file with the programs that need it. ZookaWare PC Cleaner corrects those entries, getting your system running error-free again.