Did you recently run any Registry Cleaner software on your computer?
Also, can you do the following
=Open Notepad (START>>>RUN>>>type in notepad)
Hit OK
Copy the contents of the CODE box, not including the word "code"
Paste it to the empty Notepad file
In Notepad click FILE>>SAVE AS
Change the Save as Type to All Files.
Name the file as export.bat
Save this file on the desktop
@echo off
regedit /e C:\cp.reg "HKEY_CLASSES_ROOT\.htc"
more C:\cp.reg >> C:\Display.txt
regedit /e C:\cp.reg "HKEY_CLASSES_ROOT\.hta"
more C:\cp.reg >> C:\Display.txt
notepad C:\Display.txt
del /q c:\cp.reg
del /q C:\Display.txt
Double click on export.bat
A text file will open, can you copy/paste back here the contents please