Cannot hide files extensions

Hello,
After last update I noticed that near my files extensions has appeared. I tried to hide them, but when I want to click on tick near file name extension(Folder -> View) nothing happens. After that I tried to change register: 
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"HideFileExt"=dword:00000001
I got information that I cannot change HideFileExt.
What I suppose to do?
Thanks for respond.

After that I tried to change register: 
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"HideFileExt"=dword:00000001
I got information that I cannot change HideFileExt.
Hi，
What information did you get? Permission issue such as "Access denied"? If so, please right click the "Advanced"\Permissions, then give youself full control permission, if you don't have permission to do this, please take ownership of
the key, then add yourself to the security group, give full control permission, then change the value of "HideFileExt", click F5 to refresh the registry.
(Pleaes make sure to first backup the registry before making any changes on registry )
http://technet.microsoft.com/en-us/library/cc755091.aspx
Yolanda Zhu
TechNet Community Support

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