This is an "informational" thread in case someone experiences the same problems. We installed RH7 on Windows 7 32-bit and accidentally, Robo Source Control was installed, too, although we do not use it. The latter loads three extensions into the shell that caused the Windows Explorer to crash on a regular basis ("Windows Explorer has stopped working"). After deinstallation of Robo Source, the problem seems to be resolved.
I like to tell you that when RH7 was built , Windows 7 was not in the picture at that moment.
I would like to tell you that this problem is an issue with RH8, as well.