It is annoying that an fault signal pops up to interrupt your gaming.
To fix it, c’mon refer to this article onMiniTool.
That may drive you crazy and overwhelm you.
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Like such a situation, in most cases, it is triggered by corrupted or missing game files.
Or your graphics drivers have been so outdated that the game cant work well with them.
In this way, you might try the following methods to troubleshoot the issues one by one.

step 1: Open Steam and go toLibrary.
Step 2: Locate and right-choose the game and chooseManagefrom the list.
Step 4: Go to theCompatibilitytab and check theRun this program as an administratorbox.

Then clickApplyandOKto save the changes.
If not, like continue the troubleshooting.
So, go to check the integrity of the game files.
Step 1: Open Steam and go toLibrary.
Step 2: Locate and right-punch the Hogwarts Legacy game and chooseProperties.
Step 3: Then go toLocal Filesand chooseVerify Integrity of Game Files.
Try these ways in this post to remove it.
Step 1: Right-press theStarticon and chooseDevice Managerfrom the quick menu.
Step 2: ExpandDisplay adapterand right-tap on your graphics card to chooseUpdate driver.
Step 3: Then chooseSearch automatically for driversto continue the process and follow the on-screen instruction to finish that.
Then your cycle your PC and peek if the Hogwarts Legacy Couldnt Start error is still there.
Step 1: Open Steam and go toSettings.
Step 2: SelectDownloadsand thenSteam Library Folders.
Dont worry, MiniTool will help you resolve these and give you a better gaming experience.