reinstalling missing files

Have you tried to restore the file using System File Checker?

Click Start>Run, type:

SFC

Click OK.

Type the name of the file you want to restore in the relevant section.

If this is not a Windows file, you are presumably getting an error asking for this file when you start a particular app. Uninstalling, then reinstalling, or running the program in maintenance mode (if available), should restore it, or give you the option to check that all files are present.

If you are being prompted for this file during startup, it is likely that the file is referenced in the registry. Search the registry for all instances of the filename, then check the relevant folder(s), to see where it should be. You may discover that the reference belongs to a program that has since been uninstalled, and that the uninstall procedure did not remove the relevant entries from the registry. If this is the case, simply back up your registry, then delete the entries that refer to this filename.

Hope this helps

It's a shard left by CleanSweep.
Here's how to fix it:

http://makeashorterlink.com/?D68B15631

Although you don't say it, I assume (don't get me started, I know what happens when you assume) you are trying to run some program (which you didn't seem fit to identify) that gives you an error saying it can't find that file. Since the previous answerer identified the file as a part of CleanSweep, I suggest you reinstall CleanSweep (or Norton SystemWorks if that's what you had) over the top of itself.

Did not work for me. Thanks anyway.