Do I need a fresh install of windows as I keep getting 'unknown available' when trying to...

I just checked and found out the problem persists with any game I own, not just one.

In the process of disconnecting/reconnecting the other drive. Otherwise I'm forced to have to wipe my PC and start again.

Thank you, usually that method is known as the in-place upgrade

https://answers.microsoft.com/en-us/windows/for...

If the issue is happening with only one game, I don't think that worth reinstalling the whole system

But if you consider it necessary. You can proceed doing a custom windows installation:

https://answers.microsoft.com/en-us/windows/for...

In any case, the best option is report this problem to Microsoft using the feedback hub app:

https://support.microsoft.com/en-us/windows/sen...

Hi, if you don’t mind. Please show me what tutorial you followed to do the repair install

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About the other question, this drive that you want to disconnect. Is the C: drive?
If not, worth trying that.
Disconnect the drive from the PC and turn the PC on
Then wait a couple minutes, turn it off. Connect the drive and verify

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this MACHINOMANCR

Additional information is needed, please tell me:

Are you using windows 10 or 11?
What game is that?
Where are you seeing this unknown installation message? (If possible attach an screenshot)

And, what did you tried so far to fix this
In that way I can advise you different things or how to proceed

Hi, unfortunately that seems the case :c usually the in-place upgrade fix system corruptions

But as it didn’t worked for you, in this case the best option is do the custom installation