I am using SQLServer 2008 R2 Management Studio (10.50.2500.0) on Windows 7.
Unexpectedly, the key combination to execute the query stopped working. The CTRL-E command still works, but it's really unpleasant since I'm so used to F5. In the query menu, the F5 command is replaced by CTRL + E.

My keyboard does not have an F-key lock button, and the rest of the F-keys work. I even tried using the on-screen keyboard so that it was not connected to my keyboard.
I think that problems arose after updating the system from Microsoft Update. How can i change it? Unable to find key reassignment options in SSMS.
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