Can you check?
If the files are gone or you can delete them easily,
copy the part in bold below into notepad and save it as clear.reg
Set Filetype to "all files"
REGEDIT4
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00212521-4FEF-4AD3-B3AA-E0531B8DC123}]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellExecuteHooks]
"{00212521-4FEF-4AD3-B3AA-E0531B8DC123}"=-
Doubleclick that file and confirm you want to merge it with the registry.
Let me know.
Regards,