Hi Ron,
Which build of Explorer Desktop did you install? Build 1750? Or the Beta release of build 2012?
If you installed the Beta release of Explorer Desktop build 2012, you would have been prompted to indicate whether you wanted to install Explorer for A) all the users on your computer or B) only your user account. If you chose the second option and installed Explorer for your user only, the Explorer files would be located in your user account's location.
For example, for my user - lind6207 - I find the Explorer executable at "C:\Users\lind6207\Explorer (x86)\bin\E3.exe." On Windows XP the location would be "C:\Documents and Settings\Users\lind6207\Explorer (x86)\bin\E3.exe".
Regards,
Lindsay