Double clicking on a drive letter opens a search screen

Here’s an interesting problem.
When double clicking on a drive letter (such as c:), instead of showing the content inside the drive; Windows opens up a search screen.

The solution is to open a command prompt screen and type in: regsvr32 /i shell32.dll

Before this problem occured. I ran Microsoft Windows Live Safety Center http://safety.live.com/site/en-US/default.htm

Note: WLSC is Beta so be careful.