File extensions have been changed

Pertinent details of my system are in the attached text file.

Shortly after running Pareto's RegCure I found that the language bar had disappeared and on reboot my desktop icons had been rearanged.

I restored thae backed up registry entries which RegCure had removed but that made no difference.

I then ran my software vigilantes, ewido anti-spyware, Ad-Aware SE, AVG free, PestPatrol, Spybot and XoftSpySE, none of which reported anything suspicious.

I then restored the system to a time before I ran RegCure, and that made no difference either.

I then went to bed, leaving the PC switched on as normal.

The following morning I found that the monitor's power settings had been changed to switch it to standby and that my default screensaver had been changed to one of Window's standard designs.

I also found that the language bar had been restored. Strange.

Furthermore, I discovered that all screensaver files are no longer listed with the .scr extension nor indeed any other extension, although hovering the mouse cursor over them tells me that they are screensavers. Although screensavers work and I can change them as I could before, I now find that clicking on them no longer opens them up in the display but opens them up in Notepad which present me with alpha-numeric and other characters of course.

This wouldn't normally be a problem fo most people, I suppose, but I occasionally create my own screensavers and it is useful to be able to run them from mouse. But in any event I want to know why or how this happened.

Any help will be appreciated.