Hi @Nick,
Welcome to Microsoft Q&A!
What is your project type? Do you have global.json file in your project folder? If so, please try to rename or delete the file.
Besides, please check your System environment variables if there are two paths to dotnet.
C:\Program Files\dotnet
C:\Porgram Files (x86)\dotnet
If so, please delete this one: C:\Porgram Files (x86)\dotnet.
Then, restart your computer and check if the project can be loaded normally.
Sincerely,
Anna
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