I’d start off by questioning that memory optimization program. It should either:
rely only on standard windows components
install everything it needs
or tell you where to get the pieces it needs
So I’m a little skeptical about whatever it is you’re trying to install.
That being said, you may already have the file on your machine. Use search for files to find it. If it’s found, you may be able to get things to work by executing “regsvr32.exe msstdfmt.dll” in Start, Run.
If you can’t find it you may be able to get it from a Windows XP CD-ROM, or from a couple of download sites on the internet. Just do a Google search on “msstdfmt.dll”. You may still need to run the regsvr32 command I mentioned above after downloading it.