if i open a midi or instruments track and try to enter the Cubase editor it freezes
Is there any chance that you have a MIDI loop - causing a MIDI feedback storm, which overwhelms the MIDI subsytem of the computer and therefore freezes Cubase?
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This could happen if you have a hardware controller, that is configured to MIDI THRU being active.
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Another (less common) cause is, when using virtual MIDI cables (also known as “MIDI loopback” and one of those is connected to Cubase in a way, that it routes Cubase MIDI output straight back into Cubase MIDI input.