d2f.dll is a DLL file. If you have seen this file on your computer, and there is an error message accompanying it, then you may have a problem with your registry. The other possibility is that it could be a virus, Trojan, or spyware.
Many versions of malware will try and infiltrate your computer by means of imitating or appearing to be like a legitimate DLL file. There are many legitimate DLL files in your registries, and it is possible there could be an error with one of them. This is how a rogue file can get in and pretend to be one of those files only to cause mayhem with your computer.
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