The f451.dll file belongs to an unknown program. This is not too unusual as many registry errors are unknown. The fact is there are thousands of programs with thousands of files and any one of these files can produce a registry error.
You still need to check the legitimacy of the error. This is done by checking where the file originates. Most people will find this task difficult if not impossible to do. It is better to have your computer scanned to check for a security threat.
If the f451.dll error is a legitimate Windows DLL error, then you will want to resolve it. As tempting as it sounds to download a new file, this may not work and could possibly damage your computer. Any time you mess around in your registry, you run the risk of changing the wrong file and permanently damaging your computer.
It is safer to run a registry cleaner. ZookaWare PC Cleaner makes the task simple enough for even the most illiterate of computer users. Simple click “Scan” then click “Fix Errors.” ZookaWare PC Cleaner removes 100% of registry related errors guaranteed.