A. Read the rules. We dont allow any discussion of Emulators at all for any system, especially Nintendo since they have copyrights and patents for their emulators.
B. It is against rule #1 to try and dictate who responds. You are here asking for help, you have no right to try and tell people "No useless posts" when you have no idea if they will be or not. You are here asking for help, any and all information provided can be of help.
MoM that would be, if they would include the .exe file extension or the Windows Installer as options anywhere in there.
You will have to use a Restore Point. Either that or you can try to repair the Windows Installer.
Windows Installer Troubleshooting
How to Repair Windows XP Installer for Free | eHow.com