That's good urlmon.dll is in both system folders. I would try to register them both again.
- open command prompt as administrator then copy (ctrl + c) and paste (ctrl + v) in these two commands. One at a time.
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- C:\Windows\System32\regsvr32.exe "C:\Windows\System32\urlmon.dll"
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- C:\Windows\SysWOW64\regsvr32.exe "C:\Windows\SysWOW64\urlmon.dll"
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- Reboot PC
Does the regsvr32 commands come back as successful?
To run the Command Prompt as administrator, create a shortcut icon of the Command Prompt on your Desktop. Then right click on the shortcut to 'run as administrator'.