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Why is blur gallery greyed out
Is the layer selected & unlocked?
Are you working with image mode RGB, 8-bits/channel?
Can you show us a screenshot of your workspace including your Layers panel?
Let's make sure we're in a default state and there are no stale settings somewhere:
Restore your preferences using this manual method:
Does it work correctly?
If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
It may help if we could see your Photoshop System Info. Launch Photoshop, and select Help >System Info...and copy/paste the text in a reply.