If you are wondering how or what all these funny files (more listed below) are sitting on your c:\ or other drive, then you will be please to know that they were generated as temporary files by a Visual C++ redistributable install package. Unfortunately the package does not clean them up afterwards.
If they are not on your c:\ drive, that because the installer actually looks for the drive with the most available space or something like that!
Any of the following files can be safely removed.
For Microsoft’s article see http://support.microsoft.com/kb/950683